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Battery Tests, Homemade 3000mAh XL Battery & Q&A (POST #1) - New Layout
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QUICK GUIDE:
Post #1: Battery Test / Buyers Guide Post #2: Battery Mod / Homemade XL Battery, Users Mods & Info Post #3: Battery Meter, Q&A & etc... Before asking questions please look to Post #3 under Q&A (Work in progress) News: You can measure the capacity of you battery your self via your N900 using some scripts (NOTE: Not the method the battery's in this thread was tested with, this was done with more consistent equipment) impeham made a script to make the battery measuring much simpler get it here This is a new Thread to sum up battery's bought from EBAY, DX and else where. This is a thread to show people where to buy and where not to buy. Update: Battery's are now sorted after capacity (Real) and will only display battery's that can be bought, update still in progress, also need a new confirmed source for SCUD. Old results are in post #6 - https://dl.dropbox.com/u/29047266/N9...%20Battery.png PolarCell Batterie Nokia X6-00 5230 5800 N900 C3-00 BL-5J XpressMusic XM Battery - https://dl.dropbox.com/u/29047266/N9...%20Battery.png Japod BL-5J Replacement 3.7V 1350mAh Li-Ion Battery for Nokia 5800 - https://dl.dropbox.com/u/29047266/N9...%20Battery.png Genuine Nokia BL-5J 3.7V 1320mAh/4.9Wh Cellphone Battery for 5800 - https://dl.dropbox.com/u/29047266/N9...%20Battery.png High Capacity 1500mAh BL-5J Battery - https://dl.dropbox.com/u/29047266/N9...%20Battery.png Pisen BL-5J Replacement 3.7V 1250mAh Li-Ion Battery - https://dl.dropbox.com/u/29047266/N9...%20battery.png BAT MAXXIMUS NOKIA 5800 1600mAh Li-Ion battery - https://dl.dropbox.com/u/29047266/N9...%20Battery.png KBTEL KB-5J 2150mAh Rechargeable Battery - https://dl.dropbox.com/u/29047266/N9...%20Battery.png Mugen Power Nokia N900 2400mAh Extended Replacement Battery - -------- List of whats next ------- Bought and waiting for delivery ----- ---- Future Test ----- --- Testing with eqipment ---- I use a charger/discharger for RC systems, it gives the mAh value when it charges and discharges. My procedure is to charge the battery for testing completely up, then discharge it completely down, this gives me the mAh when discharging, now i charge the battery all the way up again, this gives me the mAh again, now the results i post here are the best "score" the battery achieves. All battery's are first subject to 5 charge cycles, this is to get the best result, it of course does only mean a gain of 5 - 20mAh but it still counts. --- Video testing will not be done anymore since the mAh test is all that is needed --- My video testing on the phone is done with videos converted to H.264 to the limit of what the phone can handle, and im using custom brightness level 3, which is brightness 160 so that consumes some power. Spreadsheet of the battery's tested so far: (same order as above) News: Now in color (RED = BAD, BLUE = OK, GREEN = GOOD) http://dl.dropbox.com/u/29047266/N90...est%20List.png UPDATE: have cleaned up the results, now no more video play length. The video test is still a good way for you out there to test your orig. battery VS battery bought elsewhere. Winner battery so far is Scud blue DREAM 1460mAh@1530mAh from aliexpress.com Attachment 25660 This Post is going to be edited alot of times so check here for updates. --- If you like the work im doing just click "Thanks!" :) --- --- Since i used beyond 300$ so far making this buyers guide, donations are also welcome :) --- |
Re: Battery Tests and Phone Battery Mod
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Price adjusting for the new higher cost of mugen covers.
--- old news --- First MOD was with the 2 fake ys4u battery's. of course this has no real benefit because of the low capacity. --------- Mod 2 - 2x 'christgift' --------- Second MOD has the 2x 1250mAh battery's from 'christgift' Have not included a schematic because this new 2512mAh battery uses the circuit from one of the new battery's, so now the circuit is where it normally is, and now there are only 2 wires (+ & -) to worry about. The 2mm DC has a direct connection to the battery's before the protection circuit, i use a dedicated charger this way. The new battery really really works :) Can really feel the 2512mAh or the 90%+ increase in capacity. If any of the new battery's that are in route are better (1300mAh+) than it would be MOD nr 3. :) And so far it's 25$ for 2x battery's and mugen cover. Of course the price so far has been higher because of all the battery's i have bought, but that is all so for testing purposes and to make a big buyers guide for you out there. --------- Mod 3 - 2x Japod --------- This 3 mod has 2x Japod 1350mAh battery's and has a total of 2763mAh, a 109% increase in capacity from the stock original nokia battery but does cost 10$ more than mod 2. --------- Mod 4 - 2x Scud --------- Attachment 18756Attachment 18757 Attachment 18755 Zip contains additional photos of the dual scud battery This 4 mod has 2x Scud 1420mAh battery's and has a total of 3044mAh, a 130% increase in capacity from the stock original nokia battery (1320mAh) Price: 32$ 17$ - 2x Scud 1420mAh + shipping 15$ - Mugen XL cover Just corrected the price, i only paid 17$ for 2x!!!!!! --------- Dual Battery Schematic --------- Attachment 18810--------- Disassemble Battery --------- NOTE: Pictures is of the crappy battery from 'londonmagicstore', didn't have any more scud battery's to take pictures of....Attachment 18754 Zip contains photos of what to do Youtube Video of the disassemble of the battery Description will come soon... --------- Mugen Cover --------- ATTENTION: Mugen has changed it's policy on selling these covers, now you have to submit a order nr. for previous bought mugen battery... or you can submit a picture of your broken cover to prove that you have bought a mugen cover/battery before. This of course makes it very hard/impossible to make a dual battery....NEWS (11/8) octagonhead tried to order a cover with a random/fake order number and it worked, so as stated input 50002XXXX (replace the x's with some small random number, less than 3000) in the previous order nr, and until mugen again scratches their head this should work. How to buy the mugen cover. Go to https://www.mugen-power-batteries.co...backdoor.html# and order HLI-N900XL, dont worry about if you never have ordered a mugen battery they don't check, as of now i have got 3 covers and i have never bought any mugen battery's ever. HtheB wanted to add that if you use the voucher code FACEBOOKSPECIAL you get a 7% discount (this if for everything on the mugen website, not just the XL-Cover) --------- Other Users Mods & Info--------- 'sEKI' Nice looking dual Blue Dream Battery'zimon' Very simple and easy to do 'cantruchd' Very simple and battery's can be reused as singles 'KetkuFIN' The NON-Mugen cover version of a dual battery 'electristan' Take on the 'cantruchd' mod 'wakko' version done like my version 'sanros' Dual Scud using 'cantruchd's mod 'Estel' Extra mugen cover modding, camera lens shutter 'dr_frost_dk' BatteryGraph of Dual Scud POWER!!! 'dr_frost_dk' My simple and cheap external/internal charger So if you think this is useful just click "Thanks!" :) |
Re: Battery Tests and Phone Battery Mod
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And if anybody else have bought battery's and want to share there experience, please do.
Also if anybody have some battery's that they want to see tested please link here also A good home test is simply to compare runtime with continues video play, put 2-3 movies on your phone and compare original battery to the battery you bought. than it's just a matter off leaving the phone alone to play movies and just checking up on it with 10min intervals. My N900 is only about 1 month old so my original battery is pretty fresh. --------- Battery Meter --------- I have been doing discharge tests on the original battery to make a graph since im very tired of the normal battery meter that doesn't work very well.So here is my QBW script for my own meter Version 1.1 This meter is precise to 2% since my discharge graph is only made with 2 digits. But it really shows you the REAL remaining capacity (+/- 2%) and also current voltage. The output is "3.800V - 50.0%" UPDATE: Have made a new small V1.6 of the meter with LED notification when battery is 15% and lower and now also indicates when charging. Install instructions: Place .PNG images in /home/user/MyDocs/.images/queen_beecon_dir/ And import beecon in QBW Attachment 20215 Attachment 20216 NOTE: if you have any problems with the display the fix is here http://talk.maemo.org/showthread.php?t=70590 This is to fix the display if it shows a weird %. NOTE: As of power kernel v47, there has been another display error caused by dual mv output, the fix is here Attachment 17769 Change log: Ver 1.6: Same as V1.5 but added "Charging" text when charging Ver 1.5: Small design with LED notification when <15% Ver 1.4: Same as V1.3 But now with LED notification Ver 1.3: Same as V1.2 But code has been refined thanks to No!No!No!Yes! Ver 1.2: Now with background color to give a less dull and more visual detail of the current battery capacity Ver 1.1: Just an update, changed % to 1 digit since it never shows more anyway --------- Q & A --------- Decided to make this because many of the same questions keep coming up, and it is understandably since there is over 300 posts now, it can be hard to find something specific.This is new, and will be going through the hole thread, this will take some time...... Q: Can i use 5800 XL battery instead of Dual or Mugen battery? A: No, the pins are on the wrong side, you would think it would work but please read a few posts ahead from here Q: What is the lowest Voltage before the phone shuts off? A: 3.3V or 3300mV is where the phone sets the limit. Q: Is the battery empty at 3.3V? A: Pretty much, on a normal 1320mAh battery you will at this point have a maximum of 25mAh left before hitting 3.0V, and from 3.0V to 2.2V (ABSOLUTE MINIMUM) there will be 5mAh more. Q: Doesn't the mugen cover make the N900 massive/thick A: It's not to bad, but it has a funny advantage, it is easier/better to type on the keypad Q: my battery only shows 1222mAh not 1320mAh A: This is not accurate because this is set by a resistor, this means you can make your battery report anything from 200mAh to >3000mAh, this has no relevance, my test is like i wrote in post #1, based on equipment to measure capacity. --------- side note --------- Now that i have various battery's laying around i made a small pocket flashlight, this is made with a mix of white and warm white flat top LED's and the 2 battery's from 'ys4u'.The mix of warm white and white is to get a neutral white 'color'. Only has about 2 hours runtime on the poor crappy battery's. Attachment 17039 |
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I bought this one few months ago from DX: http://www.dealextreme.com/details.dx/sku.32444
It is an original Nokia battery, and atleast the one i've got from them is completely original (no fake). The capacity is also equal to any other bl-5j nokia batt (i have 4 of them), so for those looking just for an original replacement, this is the perfect deal (for the price, of course). |
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damn,your phone looks really fat.does it fit in your pocket? or do you have to carry a special bag for it???? |
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its not that bad as many think, and for now it's the only way to get heavy use of the computer/phone. Lithium battery's will get better, read that with the help of nano technology the capacity can get up to 10x what it is now. Would be cool with a battery with 10000mAh+ or as i would say 10Ah+, this will of course need a good charger or some time to make a full charge from empty. Some reading: Lithium-sulfur batteries could store triple the power of lithium-ion New Nanowire Battery Holds 10 Times The Charge Of Existing Ones -------- BACKUP of POST #1 --------- Just placing all the old results here to make way for a new cleaner look and with current battery's only. -- Original battery that came with my N900 -- Original battery was tested and has a capacity of 1300mAh -- 1920mAh battery from 'e_cell' (EBAY) -- 1930mAh BL-5J HIGH CAPACITY BATTERY FOR NOKIA 5800 N900 Capacity for this battery should be 1920mAh After extensive testing the capacity was 800mAh -- Nokia BL-5J Battery from 'ys4u' (EBAY) -- HIGH CAPACITY REPLACEMENT Nokia BL-5J Battery 5800 X6 Capacity for this battery should be 1320mAh After extensive testing the capacity was 800mAh -- Nokia BL-5J Battery from 'christgift' (EBAY) -- REPLACEMENT BL-5J BATTERY FOR NOKIA 5800 XpressMusic Capacity for this battery should be 1320mAh After extensive testing the capacity was 1250mAh Nokia BL-5J Battery from 'oig.buy' (EBAY) REPLACEMENT BL-5J BATTERY FOR NOKIA 5800 XpressMusic Capacity for this battery should be 1320mAh After extensive testing the capacity was 1250mAh Nokia BL-5J Battery from 'fashionuniononline' (EBAY) REPLACEMENT BL-5J BATTERY FOR NOKIA 5800 XPRESSMUSIC Capacity for this battery should be 1320mAh After extensive testing the capacity was 1250mAh High Capacity 1500mAh BL-5J Battery (Eastmaze) High Capacity 1500mAh BL-5J Battery for Nokia Cell Phone Capacity for this battery should be 1500mAh After VERY extensive testing the capacity was 1300mAh NOTE: This battery was hard to test because it has a very good protection circuit, and my charger charges the battery's to the MAX!!! This battery does not do what it says it will do but it at least has the same capacity as the orig. nokia battery BL-5J Replacement 3.7V 1320mAh (Dealextreme) BL-5J Replacement 3.7V 1320mAh Li-Ion Battery for Nokia 5800 Capacity for this battery should be 1320mAh After extensive testing the capacity was 320mAh !!!! NOTE: was expecting 500mAh since i know this battery is fake, but 320mAh!!! damm this battery sucks.... hehe Japod BL-5J Replacement 3.7V 1350mAh Li-Ion Battery (Dealextreme) Japod BL-5J Replacement 3.7V 1350mAh Li-Ion Battery for Nokia 5800 Capacity for this battery should be 1350mAh After extensive testing the capacity was 1370mAh NOTE: The first battery that does what it says it should and then some :) Pisen BL-5J Replacement 3.7V 1320mAh (Dealextreme) Pisen BL-5J Replacement 3.7V 1320mAh Li-Ion Battery for Nokia 5800XM/5802XM/5900XM/5230/X6 Capacity for this battery should be 1320mAh After extensive testing the capacity was 1280mAh Genuine Nokia BL-5J 3.7V 1320mAh (Dealextreme) Genuine Nokia BL-5J 3.7V 1320mAh/4.9Wh Cellphone Battery for 5800 Capacity for this battery should be 1320mAh After extensive testing the capacity was 1320mAh EXTENDED 1500 mAh BATTERY FOR NOKIA N900 (londonmagicstore) EXTENDED 1500 mAh BATTERY FOR NOKIA X6 5230 5800 N900 Capacity for this battery should be 1500mAh After extensive testing the capacity was 900mAh NOTE: can see through the paper cover that it says 1000mAh.... HIGH CAP GOLD BL-5J BATTERY FOR NOKIA N900 (EBAY) HIGH CAP GOLD BL-5J BATTERY FOR NOKIA N900 5800 XPRESSM Capacity for this battery should be 1930mAh After extensive testing the capacity was 1250mAh NOTE: Fake battery but still good since it is close to normal capacity of 1320mAh SCUD 1420mAh Nokia BL-5J Battery (aliexpress) scud 1420mAh Nokia BL-5J Battery Capacity for this battery should be 1420mAh Retested by Estel, and the capacity was 1250mAh Scud changed this battery to fit all nokia models, this is no longer the champion PolarCell Akku Nokia X6 N900 5800 XpressMusic 'wannsee-electronic' (EBAY) PolarCell Akku Nokia X6 N900 5800 XpressMusic (BL-5J) Capacity for this battery should be 1400mAh After extensive testing the capacity was 1400mAh 2250mAh Capacity BL-5J Battery (deal24hours) 2250mAh Capacity BL-5J Battery For Nokia 5800 N900 C3 Capacity for this battery should be 2250mAh After extensive testing the capacity was 1410mAh 1700mAh BATTERY for NOKIA BL-5J 'phone_repair_parts' (EBAY) 1700mAh BATTERY for NOKIA BL-5J Capacity for this battery should be 1700mAh After extensive testing the capacity was 1390mAh KBTEL KB-5J 2150mAh Rechargeable Battery (Dinodirect) KBTEL KB-5J 2150mAh Rechargeable Battery Capacity for this battery should be 2150mAh After extensive testing the capacity was 1220mAh NOTE: Says 1200mAh under papir cover. MaXXimus 1600 mAh Nokia 5800 battery (maxximus.pl) MaXXimus 1600 mAh Nokia 5800 battery Capacity for this battery should be 1600 mAh After extensive testing the capacity was 1250 mAh NOTE: Tested by 'Estel' Link provided redirect to google-translated (Polish to English) version of battery description. build-in buy function is valid only for addresses in Poland, but they're willing to send abroad (for higher price) if you contact them via contact form. If only would anyone want to buy their overpriced battery ;) It seems to me that it's same battery as christgift is selling, only rebranded. SCUD Li-ion Battery BL-5J for Nokia N900 (aliexpress) SCUD Li-ion Battery BL-5J for Nokia N900 Capacity for this battery should be 1445 mAh After extensive testing the capacity was 1520 mAh Mugen Power 2400mAh XL Battery (mugen) Mugen Power 2400mAh XL Battery Capacity for this battery should be 2400 mAh After extensive testing the capacity was 2240 mAh Scud Blue DREAM 1460mAh Battery (Aliexpress) Scud Blue DREAM 1460mAh Battery Capacity for this battery should be 1460 mAh After extensive testing the capacity was 1530 mAh SCUD 3.7V 1450mAh BL-5J Li-ion Battery (avatardeals) SCUD 3.7V 1450mAh BL-5J Li-ion Battery Capacity for this battery should be 1450 mAh After extensive testing the capacity was 1520 mAh |
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I was rather impressed by:
http://www.eastmaze.com/High-Capacit...1394.html?c=63 In a few test runs it's come out as 1310 - 1330 mAh using N900's own battery fuel gauge chip, and assuming RS=21 as determined experimentally by one of the kind sould in #meego. Impressive that it's as good or better than original Nokia BL-5J, which iirc tested out as 1250-something with the same method. Internal resistance "feels" like its lower, but that might just be a sign that there's no protection circuit in it... The bq27200 fuel gauge doesn't use any method close to a "proper" one. It just integrates current discharged, until it reaches 3248mV (and the point at which this happens varies with system load, of course), and then assumes that the battery is at 6%, calibrates charge meter according that. The 0% is assumed to be at 3V. Under normal operations N900 doesn't reach voltages this low. My 2400mAh mugen showed up as 2400mAh with the same method when new, and now after some months of abuse it shows up as 2300mAh. |
Re: Battery Tests and Phone Battery Mod
When you say "dedicated charger", do you mean an actual Li-Ion charger, or are you hooking up some random Nokia "charger" powersupply?
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Could all so hook it up to some random Nokia charger, but than i would have to monitor the battery or else it would go way beyond 4.2V and potential cause the battery to vent with or without fire or explode. The best thing with my own custom "charge port" is that i can charge with 1C no matter how big the battery is, which means that when i get some good battery's with 1200mAh+ than i can charge the battery with 2.4A, this will mean that charge time would be max 1.5 hours. Or could charge for 30min and have enough power to last a day with good usage. |
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Are you sure you only get 2hrs from your Nokia bl 5j because I can get like 6 to 10 really... and 800mAh? I thought it was 1200mAh
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On the original batt i get a minimum of 4 hours. But my videos are high encoded to the point that it just plays them without lags. And im using custom brightness level 3, which sets the brightness to 160 which is between 4 and 5 without custom brightness, this means more power usage then normal level 4. |
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Sorry about that. I play vdieos in like .mp4 format brightness level 1 with no lags and I get those amount of hours.
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Btw a request would be to check a Nokia BL-4S which is half the original Nokia BL-5J and claimed to hold 860mAh
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And my videos dont lag, only when some event disturbs like sms or im. |
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Oh I've been trying to find some manufacturer specs on charge rates. I known 1C is fine for rc LiPos.. Some 18650 have 0.7C as max.. and N900/bme uses 950mA.. which is about 0.7C for BL-5J.
The hardware itself is capable of charging at 1250, so either they picked 950 because that's the maximum achievable with 2mm charging system, and there's alot of wtf-ish emulating of 2mm system ontop of this proper charger inside N900... Or, it was picked because it's 0.7C and max for battery.. |
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Charge rate really swings all over the place, some can have as little as 0.3C and some can have 3C Some power battery's that will probably not be used in a phone have about 12C. Breakthrough lithium battery charges to 90% in just 5 minutes Lithium Ion Battery breakthrough promises 100-fold boost in performance |
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By "2mm system" I mean the whole combination of powersupply, battery and battery charger, and the relatively peculiar methods and charge algorithms used in all Nokia products with 2mm charge port. Nokia even published a pdf documenting parts of it. I wasn't talking about the connector or your connector as such..
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another good thing with the dedicated 2mm charge plug is that ware & tear is going to be a minimum on the micro-USB, speaking of all those that have experienced loose USB. |
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I can see you guys are exploring to make a "big tank" battery but isn't just carrying a spare battery easier? Another thing i almost forgot to ask if i'm going the spare battery route, whats a good battery charger for these bl 5js would any on Ebay do? |
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I see you have a Mugen's back cover which came with a bigger capacity battery. How did you get that, or do you also have the Mugen 2400 mAh battery?
Did you just connect two BL-5J batteries parallel on their pins 1 and 2 (+ and -)? How did you manage to do that? Soldered cables tolerable to 1A to the battery contacts, or did you break the cover of the batteries to solder cables inside? More accurate photo of the connection of the two batteries in parallel would be nice. |
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A single big battery has the advantage that you don't lose all open apps and don't need to save and reopen everything when you switch battery.
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The mugen cover cost 7$ with shipping will update with more and better pics soon on the 2 post. |
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I ordered this: http://www.dealextreme.com/details.dx/sku.32398 4 months ago, and it works well. I even get the impression that it lasts longer than the original Nokia battery; certainly good value for money. I've been using it since I received it, and have not noticed any deterioration. Japod appears to be one of the better battery brands. I would recommend it. |
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And if the next ebay battery's are no good than the double battery is going to be made of 2x Japod, i ordered 3, 2 for me and one for my friend This thread is still a basic buyers guide. |
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I also read this article about 6-cell batt on netbook (http://www.engadget.com/2009/02/08/s...arger-touchpa/). Is it possible in the future that mobile phone can use 6 cell batt? |
Re: Battery Tests and Phone Battery Mod
Identical Li-Ion batteries of same age will balance themselves automatically when connected in parallell. No overcharging issues, they'll behave alot like a single bigger battery.
As for 6-cell, the ideal for phone is one big single-cell battery. There's no benefit from having multiple cell setup, and dr_frost is only doing it because it's cheaper for him as a consumer/hobbyist to get several common small batteries instead of a custom big battery. |
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But how the phone will detect the capacity of 2000 mah on 2 stack battery?
Pisen bl-5j battery http://www.dealextreme.com/details.dx/sku.39120 i heard also good too |
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But there is a big problem with this method, there is a resistor on the circuit board that gives the value to the phone and thats why all the fake battery's i tested so far all said that they are 1250mAh but as i tested them they where only 800mAh. I can change the resistor on the circuit board to get the phone to display 2400mAh, but it is not necessary, the phone continues to operate until it sees a voltage of 3.3V, so it wouldn't matter if i put one of my 6000mAh+ battery's on it and the phone reported it to be 1250mAh, it would still use all 6000mAh+. N900 Software BME Side note pisen battery will be added to the list all so. |
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Well, I also wanna know if Pisen lives up to its expectation or not. I happened to order pisen battery (about 3-4 weeks) and still didn't receive it yet (via free airmail). But I read that Pisen is a quite big company in China. Maybe Japod's equal or even better.
Here is the official site of Pisen: http://www.pisen-store.com/ |
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Test completed for:
Nokia BL-5J Battery from 'christgift' (EBAY) 0010 Goto #1 post for result :D |
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hi there. I bought the 96 dollar extended battery, but I found the back door to be HUGE so I guess I am not going to use it anymore. It did have a big effect (it is sitting on the shelf if anybody in US is interested). Anyways, what do you guys think about this battery:
http://www.mugen-power-batteries.com...t-battery.html |
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2) Couldn't one just solder two same kind of (and about same age) batteries parallel by their (+) and (-) pins and leave the circuit boards inside? 3) (then) The 3rd pin of just one of the batteries is then connected to N900 to give normal size of resistor to N900 like all fake batteries do? 4) How have you open the battery's case so you can only get cables in without breaking the connectors (and also circuit board out)? I only have two original BL-5J batteries and I wouldn't want to break them any more than necessary to test them parallel. 5) Can you also charge your two-pack battery through N900's micro-USB-connector? |
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hey shadowjk going back to the battery you pointed out, would you recommend this over the stock battery? Also frost if you are looking for the best aftermarket battery shouldn't you conisder the high capacity battery? based on shadows input looks like it could be better than the japods
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2) yes, but can be tricky 3) yes, the resistor is not important for the function of the battery 4) not that hard, there are 2 versions, 1: uses screw's at each end at the connector side, 2: connector is glued on. You can pull the connector from the battery because it has a bit of loose "wire". 5) Yes as long as the battery's are connected in parallel, but cant guarantee if you use 2 battery's and just connect them + + & - - from the connector's, since the - of the battery goes through the circuit (for low voltage cutoff). |
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The plan with this thread is to test as many battery's as possible to let you out there know where it's "safe" to buy. I don't mind taking one or many for the team :) |
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Also important to know, if some battery is missing protective circuit or has components missing.
Nokia claims many "cheap" batteries do not have protective circuits and therefore could explode. More photos would be nice of the breaked batteries, solder points and such. Diagram of the whole circuit would be useful also to make sure one has understood your "version 1". |
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