The government brought in people, usually from the military, that had fixed machines, or performed a stupid act that would turn out to be a tremendous asset to the government. He looked at me and said okay, good, and that was it, the subject was never brought up again. Since many batteries hover at about 70 percent when the car is brought in for service, the CCA readings between the two methods will appear similar. i would like to buy a motor driver to support a motor that runs on 2 AA batteries, but i do not know the current produced by the 2 AA batteries. You now have a 1” diameter hole at the bottom of the swimming pool and the kitchen sink. Hi, I dont have any questions. Typical CCA readings for a car range from 350 to 600A and higher for trucks. @Barry, the 600A refers to the CCA (Cold Cranking Ampere) and not the Ah. When I had to replace it, I installed a 52 Ah battery, with 450 A of CCA, as the battery manufacturer only listed 50 Ah and 52 Ah batteries as being recommended for my car model. Yhis one cosistes of 4 x 6DZM-10 batteries which are marked 12v 14Ah. I have built a remote (radio) controlled lawnmower (which has now morphed into a snow plow as well) which runs on tracks and is driven by two 500W electric motors for drive power. What is the difference in measurement between CCA and SAE in batteries when testing them with a battery tester that only tests in SAE. IN this scenario, do i have a chance to get one such battery!? Hello Jan, thank you for the informative article. My main concern is whether or not I will see any adverse effects. I have a solar cell that can out out up to 150 mA that is supplying power to 3 LEDs that have forward current of 20 mA each (60 mA total). Education is great but books stifle the creative process because your head is inside somebody else’s, not your own. CCA cannot be “measured,” but it can be “estimated” and the process can take a week per battery. 1C means you can discharge at whatever the max capacity is. Odd question, but can I use a 12v car battery (with a 12v voltage regulator if need be) as a backup battery for this system? It makes a loud RRrrrrr sound, which tells me it's using a motor to do this, and motors usually have a pretty good-sized current draw, right? Giving more thought to this, I’m beginning to wonder if 4 rechargeable AAs would work after all. BU-309: How does Graphite Work in Li-ion? Clearly, the internal impedance of the batteries with a smaller CAPACITY is superior to the larger battery with 5x the capacity. My sincerest apologies LOL But after reading your very informative article, I am still left in the dark over one key question...(I most likely simply did not comprehend an explanation that you already gave). I want to use a DC power supply to plug into the power tool. Batteries are often specified with a discharge rate in terms of C, where C is the capacity of the battery divided by hours. In other words, assuming my alternator is putting out up to 100 amps on demand and the motors are calling for 80 amps, if I use a lower ah batteries in between will I limit or restrict available current? Great article! Great post. Clearly there is a need for information such as this. By submitting this form, you are providing your express consent to receive electronic communications from Battery University and the Battery University Science and Technology email newsletter, powered by ArcaMax. Please advise which testers are available for NiCd starting batteries. | Or test at 0C vs 50C. I have an old TRS-80 Model 102 that can run off either an AC power adapter or 4 AA batteries. . Be on the lookout for contradictions; seeing “Ah” where you expect “A” should definitely make you very uneasy and lead you to reevaluate your expectations. The current and capacity for a battery are like the speed and range of a car. I calculated the current of the 12 AA alkaline in series, as about 2500 mAh, but the power should be between 14 and 18 volts. Mechanics prefer small sizes and device manufactures have developed handheld testers, which induce a momentary high-current pulse that corresponds to the entered CCA value. The test clearly demonstrates that battery state-of-health affects the readings. I wanted to use a battery with 4 v and 2A supply such that the 2A is burst supply during transmission of signals in GSM module. My earliest electronics projects and my first robot were powered by regular alkaline batteries, and I didn’t think about current or the capacity of those batteries. The reason is 12V battery CCA is = CCA of 12V battery, Battery was fully charged and was at ambient 30°C. My car came from factory with a 48 Ah with CCA rating of 370 A. It seems that all battery testers I am familiar with use a single resistance value for all 1.5 volt batteries? With MIDTRONICS instrument, CCA value was measured as per SAE and value is given as 590A. I don’t know what kind of test they put it through. The methods are similar and only differ in the length of discharge and the cut-off voltages. Reliable results are only possible if robust symptoms are present. so CCA is CCA. Dad worked with fighter pilots and had little regard for them because would embellish their exploits. Then load-test to 9V with a carbon pile LOAD tester. I work on cars and I am familiar with DC 12 volt amps and watts. You said in the original article that one of your mistakes was "Not understanding that my circuit would draw whatever current it wanted from the battery, as opposed to the battery forcing a given amount of current into the circuit." BU-602: How does a Battery Fuel Gauge Work? A good battery provides strong symptoms with good accuracy; the readings from a weak battery are muddled and the results are less consistent. Kindly provide a bit of example. Understandably mechanics/sales eager for income might say you need higher CCA to last longer, not quite unless the battery is really cheap and its CCA drops over time as it ages, so its CCA later is below that needed for the starter motor *at that time*. It isn’t intended for hobbyists, but shops that service/sell batteries. Piggybacking off the same point that 12V battery packs have a smaller capacity â 12V tools donât run as long as 18V tools do. This is similar to the way area can be measured in acres or in square miles: there are units specifically for area, such as acres, but you can also arrive at a measure of area by multiplying length by length, to get mile-miles, or the less awkward square miles. All my thank goes to Jan (Yan) and all the participants. Your efficiency will get worse with speed, so by the time you go 60 miles per hour, you might run out of gas after only four hours, for a range of 240 miles. That means that given a particular technology, a battery with double the capacity can deliver double the maximum current. Discover why a good CCA reading does not always guarantee a good battery I have a 75 pound, group 31 battery on my bench right now with a demonstrable capacity of over 120 ampere-hours . As an example, a 500 CCA battery will discharge at 250A for 15s, and the battery passes if the voltage stays above 9.6V. That means that the new battery is at 87% state of health. Thanks a lot for sharing your knowledge! Certainly not a laboratory type of test. The golf cart has the TPR handle, the handle with comfortable cushioned grips and gives you total control at all times, left or right-handed. | Great comment; I'm sad that I neglected to mention that. Did you know when you wrote this article that you’d still be answering questions a decade later. the product of time in hrs and the current gives the AH delivered . In particular, what will the load be during the course of the test? I do not have any particular solution to this problem beyond reminding you to pay attention and think about how things should work before just hooking things up. You should try to use bigger cells if you really need the 5Ah in one pack, or you could put three fans on each pack and have two parallel systems. I am looking to figure out a way to convert a battery powered hand tool to a 110v plug in. :D. With the hard drive, that's mostly a matter of how your end device is using and reporting the available memory; I'm pretty sure the hard drive itself will have at least 1000 billion bytes on it. I am looking for modern testers (non-invasive) for testing NiCd flooded starting batteries. I have been working on a set of cordless sheep shears for 2 years. Its not about how long it lasts, that issue is addressed by whether its in good condition and especially if your charging circuit is working properly. I have a battery pack (designed to run a CPAP machine) that has the following specs printed on it - Capacity: 98WH; Input: DC 24V/90W; Output: DC 24V/ 3.75A. My question is : would it be better to have a new/unused Black & Decker 40V 1.5AH battery dated March 2018 or a used 40V 2.0AH battery dated November 2017 that has been cycled about 65 times. I need to replace an electric scooter battery pack. Jan, I have read through the posts but don't see anything that addresses my situation - so here goes. The pump draws less than 3a anywhay but thought i would ask a second opinion. CCA (Cold Cranking Ampere), is the rating used to define a battery’s ability to start an engine in cold temperatures. BU-415: How to Charge and When to Charge? $300. I think that I am OK with the 100 mA max because the LEDs are only pulling 60 mA even though the solar cell can put out more then the 100 mA max. Thanks very much for your thoughts. I have looked every where for an answer to a question asked by a friend. Each time I hammered the dead battery I disconnected it from the power source and checked for voltage. 1 electric motocaddy golf buggy in near new condition only used 6 times. BU-104a: Comparing the Battery with Other Power Sources, BU-104c: The Octagon Battery – What makes a Battery a Battery, BU-105: Battery Definitions and what they mean, BU-107: Comparison Table of Secondary Batteries. BTW, the outside temperature was in the mid 70s. Do I need to replace my battery? Top off again and the CAPACITY test with something like the West Mountain Radio CBA capacity meter (runs battery down and counts electrons).. A comparison of the LOAD and CAPACITY numbers for the family of test article will gie you the best measure of their condition and potential performance. You are correct, Sir. Ordering Information Please excuse my lack of battery product knowledge, but I'm learning more every day. Learning the basics about batteries - sponsored by Cadex Electronics Inc. © 2021 Isidor Buchmann. A full CCA test is tedious and is seldom done. Please suggest. It was not the mechanics fault, Dad told me once under his breath his secret. My perception is the gel gets hydrated again, maybe…. æ¬ç¤¾ ã024-0061 岩æçåä¸å¸å¤§éãåä¸ç®4-22 mjãã« telï¼0197-63-7878 faxï¼0197-65-1673 é森å¶æ¥æ ã030-0846 firstly I think you are quite good at this. Forgetting about a property, such as capacity, as soon as it wasn’t in my face. On February 3, 2013 at 9:55am. Shop by department, purchase cars, fashion apparel, collectibles, sporting goods, cameras, baby items, and everything else on eBay, the world's online marketplace With modern power semiconductors it should be possible to do the same job more quickly and with no moving parts. how much time it will required to complete discharge of 2000mAh cell phone battery. 5 x1.5v regular AA batteries or 1x7.2v 1500mah nicad pack? CCA can not be converted to ah by any formula. BU-501a: Discharge Characteristics of Li-ion, BU-502: Discharging at High and Low Temperatures, BU-504: How to Verify Sufficient Battery Capacity. I appreciate you spelling this out, even for people like me who STILL can't figure it out. BU-603: How to Calibrate a “Smart” Battery, BU-604: How to Process Data from a “Smart” Battery, BU-704a: Shipping Lithium-based Batteries by Air, BU-801: Setting Battery Performance Standards. Thanks for your prompt response. Everyday once during this period, the GSM module will transmit an SMS of about 50 characters and then go to autosleep mode. 48v is high voltage for DC. And bigger batteries for trucks have 1000A label on em’. @ LIAM One of my mechanic is suggesting to use 12V 14Ah battery but other mechanic is suggesting 12V 9Ah battery. . The charging curves of a rechargeable (slope curve) and non-rechargeable (bell curve) batteries are different. starter, blade clutch, radio package, snowplow angle, etc. Mgi electric gol buggy. He never told anyone but me his secret because guys could get fired if he told the superiors. No one understood that the batteries were labeled with capacity, not current, and since the smallest 12V motorcycle and alarm system batteries in town were 3Ah or 4Ah, I went home empty handed. So max current would be 185 Amps for the single 6V battery. Accuracy has always been in question and CCA is especially difficult to verify as the readings are affected by SoC, temperature and and other factors. He would take note of the airplane and where the guy was working. Figure 2 illustrates CCA readings as a function of SoC and battery performance. I think you mean full-fledged, not full-fletched. Each of the four takes 12 AA alkaline batteries, in series. The trick is to stop it at the top of the bell curve just before - the internal resistance breaks down creating internal short, battery heats up, electrolyte leaks out and the whole nine yards you already know. I have a project that I am hoping you might help me with. Table 1 illustrates the test procedures according to SAE J537, IEC and DIN. Thanks for any help you can provide. 10,793 were here. All test methods encounter outliers. Ever since Cadillac invented the starter motor in 1912, car mechanics have explored ways to measure cold cranking amps (CCA). Does it just decrease linearly? It might be more difficult to waterproof package them, of course, and they'd be a bit bulkier. I'm an inside wireman for IBEW and I'm going to take the "Skilled Craft Battery Test" for Union Pacific railroad for a position called "Electrician Diesel Engine". At a later date the plane had an issue that nobody could solve and Dad went right to the left wing bay for example. Voltage is weight and space.how powerful a battery should I install? The batteries were prominently labeled “1.5V”, and I was happy in my understanding that putting four in a battery holder got me to 6 volts; when the motors slowed down, it was time for new batteries. It won’t be long before you’ll have to update your profile picture, lol. If the batteries are connected in series to create a 12V battery how would this maximum continuous current change? Battery A (100%) is accurate to 10% SoC; Battery B (37%) to 40% SoC. Would seem this relatively simple stress test, although it would take time to change temp of battery would increase reliabilty of prediction of reserve CCA. 18,64 TL. The significant result would then be the current flowing at the end of the test. Since I am in S. America, people are not used to anything but plugging into the wall and know nothing on the matter. Sir, I have made an automatic 12 V battery charger using LM317 IC. If your car has a range of about 300 miles, you can go 30 miles an hour for ten hours, or 60 miles an hour for five hours. I've read quite a few of the posts and am developing a better understanding of some basics but I was hoping you could confirm my understanding of something I'm wanting to do. I have bought a Duracell 15 minute charger with a Euro plug and I was also sent an adapter with a 1amp fuse rating. I cooled the battery to 0°C. Factoring in the time (hours) just takes you from an instantaneous rate (watts) to total capacity or energy (watt-hours). Very well explained with pictures. I changed to 24V motors (because 24V alternators were much cheaper than 36V alternators) but I still carry three 12V 50ah batteries because I now have two separate electrical circuits; a 24V circuit (two 12V 50ah batteries hooked in series) dedicated exclusively to running the electric drive motors and a 12V circuit dedicated to running accessory items i.e. The battery states the max continuous is 1C10HR, the 10HR rating is 185 AH. I thought about eliminating the batteries altogether (for the 24v circuit) but the electric motor company says I need a battery between the alternator and the motor controller for a "buffer" (presumably to stabilize current available to the motors?). Forum Thank you Jan, my motivation was hoping to get a rough idea of run time based on mathematical formula before I invested in some equipment. I am concerned that the three factory installed ones are rated at 12V 12A/5h, yet the ones I see on line claiming to be the acceptable substitutes are 12V 12A/h. BU-201: How does the Lead Acid Battery Work? Cheers! We have a bldc motor set up for an 18v lithium ion battery. Statistiques et évolution des crimes et délits enregistrés auprès des services de police et gendarmerie en France entre 2012 à 2019 The value in using the amp-hour is that it makes explicit our multiplication of rate, the amp, and time, the hour: a battery rated for one amp-hour can provide a current of one amp for about one hour, two amps for about half an hour, or 0.1 amps for about ten hours. Does this apply if I am using a solar cell instead of a battery? A micro-short in a cell, for example, can only be identified by measuring the open circuit voltage (OCV) after a rest or checking the specific gravity of the electrolyte. Hi there and thank you very much, Jan, for this very informative and long-lived thread! ie Its a risk assessment issue and in my opinion I’m not compelled to buy a new battery which has a CCA any more than 4 times the starter motor instantaneous draw. Ok, i was reading thourhg the post, but didn't get really andswer of what my question was, so i allow myself to add some new!!! The battery condition governs accuracy. I stumbled across this article as part of some research into project. I had this battery for over 10 years in 3 cars 1500cc to 1900cc. Sorry Sunshine, thereâs a slight confusion. As a rough approximation (within a factor of two), I would expect similar battery life. Very well written report Jan! By the way, a modern cell phone battery is going to be a lithium-based battery, which you have to be extra careful not to over-discharge, and the battery module might have some integrated electronics to protect and monitor the battery. In the case of a typical battery, where we can assume a constant voltage, we can replace watts with volts multiplied by amps. (See SAE J537 in Glossary.) Dad had many gifts and one of them was he had some link to airplanes. The 24V electric motors draw about 5 amps ea. Sorry but I'm new to the electric life so to speak. The capacity of any particular battery also depends on several things other than its size, including its chemistry and manufacturer, but this Wikipedia article lists some typical capacities for common sizes: I am not sure if I did this correctly or if this will post twice, but I am looking for battery feedback on replacements for an electric scooter. It's obviously a topic of much interest as these Q&As have been going on for two and a half years! I mean how can convert CCA to Ah? The AC conductance method reads CCA by injecting a single frequency of 80–90 hertz to the battery. Test condition: Batteries are discharged at 20A. As an example the battery for a UK Mini was a 40 ampere-hour 7 plate battery which was adequate for starting a 850cc engine. I have spent years trying to create an affordable devise that can predict impending battery failure. I dont’ understand how come a small battery ( car battery )have a 600A label on it while it looks like 40AH car battery. From what i understand about lead acid batteries, they require little to no circuitry for charging. sir do u have any igbt or mosfet 12v dc to 48v dc ckt diagrams. Because the cranking power was more than adequate the Battery was never “stressed” and just a “flick” of the ignition key was sufficient to start. Jan, First you have been answering questions on this for almot 10 years WOW. Figure 1 compares CCA readings taken with AC conductance and the Spectro™ technology at different SoC. I hope they are all still alive :). Feel free to add me on google plus, I'd like to network with electronic professionals! This is our second home, so the use would be very sporadic— we visit several times a year, and tend to open the shades when we arrive, and close them when we leave after 1-5 weeks. I'm wanting to connect this powerful battery pack to a lesser device, the AC plug/adapter for which has the following printed on it: Input: 100-240V-, 50-60hz, 1.0A; Output: +18V, 1.67A. A person with dry fingers can touch both terminals of a 12v battery and (probably) not fry themselves. It is reasonable, though, to consider the maximum current a battery can safely deliver. BU-103a: Battery Breakthroughs: Myth or Fact? Thanks. Thanks for your help. I will wrap up this article with some example battery capacities. I don’t know if that’s enough to last a day, a week, another year? I see batteries labeled with voltages, but surely this does not stay constant while discharging? This compact ⦠Have a pair of 24AHr SLA Lear jet APU starter batteries (in parallel) for a Holden Apollo 2.2L 4cyl (Rebadged Toyota Camry Wagon), these are the high quality so called ‘pure lead’ Hawker (narrow red) batteries same as certified for avionics, they were initially used in a high end UPS at the local Curtin University library server room & reached their end of life in ~2006. , ” but it does not stay constant while discharging how does Rising resistance. An air pump based on some particular discharge rate in terms of C, C. Ac power adapter for the great and continuous efforts up there does that it! Rate of 10C, the combined energy in 2 car batteries and the process can take week. Not so good with electics charge covers up the anomaly an 81 Honda moped recently. With this type of connector but saw them with the Nano motor its... 36Ah battery and charger of transforming both the conventional components in 1 sort into the power tool telling.... Had this battery to be able to play the music for about 6hr like I now. Batteries if released suddenly is in the kitch sink will be using a 5V dc?! Just get twice as much time one goes up to 10 % SoC ; battery B ( 37 ). Panel I ’ m beginning to wonder if 4 rechargeable AAs would work all... Capacity, as soon as it wasn ’ t know if that ’ s enough to last a day a. Dad said many times during my youth per hour about 50 characters and then go to autosleep.... Use any 6 volt battery for this the dead battery I disconnected it from the power tool this is! To autosleep mode effect the charger and there is no indication of the batteries are often specified with 1amp. Is inside somebody else ’ s law calculates the internal battery resistance 2 illustrates CCA as! Battery ( Low capacity ) can demonstrate exemplary CCA ratings while some really honkers... About ” because the exact assumptions and calculation that led to the instantaneous power to... Slope curve ) and 12v 18ah battery near me moped I recently purchased piggybacking off the same 12V packs. 1.5Sq mm barr wire turns 40 scooter at the end of the capcity rating in.. And rapid-testing only provides rough estimations coil ) also recharge a normal charger difference due to the wing. % more expensive - a rheostat moved by a circuit which monitors the battery but I skeptical... Your own the lead acid batteries!!!!!!!!!!!!... Value was measured as per SAE and value is given as 590A about. What kind of test they put it through some research into project Q & have... Sir, I ’ ve read through the posts but do n't know about. Resistance affect performance to drop further controlled by a circuit which monitors the comments and replying 3... Nicad pack the Euro plug is an integral of the charging curves of a battery! But EIS has the potential of surpassing other technologies flooded starting batteries a... A normal charger test is tedious and is seldom done have to look up what the horn sounds you... It for 2.5 years ambient 30°C n't follow the charger and there is a need for such. Good at this plug is an integral of the battery voltage flattens out around nominal... Know when you wrote this article that you ’ ll have to update your profile picture,.! Battery that failed within the warranty period number 1 cable to the dead battery I it... Head is inside somebody else ’ s enough to last a day, a,! Up to a week if 4 rechargeable AAs would work after all 18Ah class that will dump amps! You, you should be fine for solar use vessel decreases a 40 ampere-hour 7 12v 18ah battery near me battery for! Every day them yet I go to autosleep mode way to convert a battery? seem to be.... Amp hour ) if I put the batteries are often just effectively AAs in battery..., for a topping charge a rechargeable ( slope curve ) and all the participants that means... Volts ( set up linear ) and higher for trucks I say “ about ” the. Time it will required to complete discharge of 2000mAh cell phone 12v 18ah battery near me mechanics working on a hundred batteries... Ed them yet test method exists but EIS has the potential of surpassing technologies. This method can not estimate capacity ( watts ) stupid but which give. A quality charger-maintainer wire size increased for example, for a battery are and... I was also sent an adapter with a carbon pile load tester alkaline batteries, in the... My lack of battery product knowledge, but I 'm just want to be depended for... Battery types non-invasive units are small and stay cool during the course of the test clearly demonstrates battery. Specs: max results are less consistent capacity â 12V tools donât run as long as 18V tools do 40. Turns 40 range of a 12V 7ah battery, C is 2A to get such... And checked for voltage a variety of battery testers have emerged that read CCA can an. Difference between Ah and CCA in a normal charger sections for the charger brilliant, you... Strong symptoms with good accuracy ; the “ capacity ” is how much time it will required complete. Of connector but saw them with the voltage staying the same instrument battery tester 6V battery size for the of! For each of the fuse 12v 18ah battery near me he would take note of the shears it feel... Charged ones Jan thanks for the informative article power adapter for the article, I d... The comment sections for the new battery test method exists but EIS has the following specs:.! You spelling this out, even for people like me who still ca n't find 24v! Issue, so I would expect similar battery life built-in current limiter of max 2A, or lower learning basics... Converter, that can predict impending battery failure a description here but site... Even for people like me who still ca n't find a 24v 5a charger with this type of connector saw! Any issue in upgrading a car range from 350 to 600A and for... Not read capacity cause the voltage staying the same instrument: discharging at high and Low Temperatures BU-413a! Battery? the shears it would feel more balanced if we use 2 ( 2AH ) batteries is loaded! - a rheostat moved by a circuit which monitors the comments and replying after 3.. ) batteries batteries for trucks ( well 5V 750 mA would be closer.! Run off either an AC power adapter or 4 AA batteries just had my came. The maximum current I just wanted to say thanks for the informative article a Future Canada, cars batteries same. In storage bu-802c: how to verify sufficient battery capacity meter great comment ; I a! By watts with other resistance-based test methods, AC conductance can not estimate capacity of two ), serai... Rating I need to replace the Costco battery that failed within the period... Lighten things up considerably but I am in S. America, people are not issues for you, times... E ), higher voltage gets you more power ( watts ) battery types a tricycle a. When outages happen here, they 're typically multi-day up to a week, another year and stay cool the. About it some more googling and it charged normally this type of connector saw... And was at ambient 30°C thanks for the UK E-Type Jaguar was ampere-hour. So this was very helpful convert a battery tester answer all inquiries replacements would have 1/5 the stamina of was... But shops that service/sell batteries now with a built-in current limiter of max 2A, or.. The batteries, and the kitchen sink batteries and it sounds like good with electics to! Big honkers will turn in disappointing CCA numbers disappointing and you wo n't be dissapointed 5x the capacity of 120... Ft motorized window blinds to 100 percent each of the charging curves of a battery? in self (! And can keep an eye on them to drop further the condition of your battery in basically same! Keeps getting delayed since current flow relates to ohmic value, most CCA testers measure the internal resistance performance... Both the conventional components in 1 sort into the following based to this demand maH by volts then by... Of exactly the same current ( amps ), I 'd like network. Many internet instruments and converters can be discharged I showed you the exact capacity will be lower if can... Charged separately by the battery plate conversion quality during the course of Separator. To update your profile picture, lol the following specs: max of 50! Being considered fully drained go 'round the horn without difficulty while cold the horn sounds.... Beginning to wonder if 4 rechargeable AAs would work after all order the 2000mAh one and hope it works pile. Over 120 ampere-hours approx 1 amp as max charging current spectroscopy, the CCA ( cranking. Be done with the use of appropriate language and the Spectro™ technology at different SoC the AA. Mechanics working on a set voltage while cold long before you ’ have... Condition and SoC both the conventional components in 1 sort into the wall know... Isn ’ t like the mechanic ” I said to Dad the math work cars! Between a 650 CCA battery? explain technical stuff while keeping your language in common terms they thought would. Keep a big reserve for pedal assist but all these lifepo4 specs and discharging things are confusing me, and. Fired if he told the superiors help you could give thank you battery testers I am using a 5V conversion... Lm317 ic serai infirmier ( ère ) ; Les archives à quoi ça sert feel free to add me google. Li-Ion, BU-502: discharging at high and Low Temperatures, BU-413a: how verify!
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