Don't throw out your bad 3S lithium ion polymer battery - CONVERT it to a 2S lipo battery

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This is part 2 of 2 of a short video series on broken (Swollen 3S batteries).
Part 1 can be found here: • How to open up a swoll...
If you don't want to throw out and waste precious money you've spent on your 3S lipo battery, an alternative would be to convert it into a 2S cell battery with a balancing port. Watch this video on short tutorial on how to do that.
If you found this video useful, please give thumbs up so that other youtubers can locate this video a little easier.
Check out a DJI F550 hexacopter long range FPV attempt using one of these Turnigy 5.8mAh batteries:
• DJI F550 Medium to Lon...
Have you seen my other video of the DJI RTH - Return to Home Demo?
• Part 1 of 2 - DJI NAZA...
Have you seen my tutorial on IOC HL (Intelligent Orientation Control - Home Lock)?
/ n0pmqndgsr
You have to see this mid air collision between a DJI Phantom and a DJI F550:
• SlowMo MidAir collisio...
I have a separate video on recycling 18650 lipo batteries along with some applications for these cool and ever more popular batteries:
• 18650 Lithium Ion LiPo...
The "C" rating shown on the pack is a claim by the manufacturer, telling the maximum operating current that can (supposedly) be drawn from this battery. Manufacturers often additionally claim even higher numbers for short periods of time, calling that the "burst" current. The "25 - 35 C" rating stated on this pack allows for up to 145A - 203A to be drawn without damaging the pack (up to 35 times nominal capacity), but no claim for a "burst" current is made.
In reality, many packs do not live up to their specs but the user never notices since only very short peak currents are drawn. When stressed to the limits or beyond, the tabs on these batteries burn off, de-facto acting as a fuse. When burning through tabs, batteries can catch fire. There are many videos on RU-vid showing lipo fires, some of which are very vicious.
For those of you using these batteries for flying, using a battery that does not have the required C rating will cause your flying machine to crash due to lack of adequate power availability.
Use extreme caution when working with lipo batteries. Store them in a place that would allow them to burn without setting your house on fire. Lipo batteries (many different brands) have been known to catch fire a day after having fallen to the ground, not having shown damage.
Never charge without supervision. Use only appropriate chargers. Never over-charge. Never over-discharge. Try to alway balance charge.
Thank you for watching.
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Опубликовано:

25 окт 2014

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Комментарии : 30

@luckydubeinrc5165 9 лет назад

Thanks for sharing, appreciate it.

@ShowHowCast 9 лет назад

Lucky Dube in RC Glad it helped!

@franky5angels77 9 лет назад

thank you worked out great

@ShowHowCast 8 лет назад

You are welcome. Good luck with your future projects! SHC

@1979zeesh 7 лет назад

i have a LIPO charger that has separate 2S and 3s charging ports. with this setup, i see you use the same 4 wire port. should i put it in my 3s (4wire) port or change the port to 3 wire one and use 2s port?

@Crix4evaTnT 8 лет назад

Hi just a question i have a 5200mah 3s with one bad cell so i did this and made it a 2s ok what i want to know is how do i find out how many mah each cell is do i divide 5200mah by 3 to get per cell mah or is there a different way ? pls help

@ComputermanAM13 8 лет назад

In a 3S 5200 mah every cell has 5200 mah. In a parallel battery you sum the mah: a 9000mah is a 3x 3000mah

@carlosaero1657 9 лет назад

nice work. good safety measures. Look on ebay to pvc shrink film. you can build a brand new battery.

@ShowHowCast 8 лет назад

Good point. Thank you for the tip.

@gabrielbalint303 9 лет назад

Hy.Nice video. Please tell me if i do this what it will be the baterry capacity.it remain the same?

@ShowHowCast 9 лет назад

No, it will not remain the same. The battery capacity will drop by 33%.

@gabrielbalint303 9 лет назад

Thank's for your answer. I followed the steps like in your video the only difference is that my batt is a turnigy nanotech 3s and instead having 3 cells when i open it it have 6 cells. I followed the steps and i removed the first two cells 1 cell was 3.3,2cel was 4.12 and 3 cell was 4.05 so i removed the first two cells. I did that thing ok? My initial capacity was 6.4 and now what charge current should i use? Cheers. Sorry for my english.

@ShowHowCast 9 лет назад

Gabriel Balint If you have 6 Cells and your battery is a 3S2P, then you would have to remove 2 cells (that should be connected in parallel). You should have 4 cells remaining - 2S2P.

@NitrousBanshee 6 лет назад

I know this is old but if you have a 3s, 4s, or 5s lipo everything should apply as long as the cells are in parallel(and as far as I know they all should be.) And the reason I say that is because every time you add a cell it adds 4.2v to the total voltage. Each cell is 4.2v this will not effect the capacity of a battery. A 5s 2000ma battery will have the same capacity as a 1s 2000ma battery. The only difference is the voltage. Idk if that helps or not. I'm sure someone will have something to say about this but I'd have to argue. :) Charge it the same. As you did previously except change the cell number on your charger.

@andrewfrater6238 6 лет назад

Dude super helpful video, can I do this with a 4s batteries too?????????????????

@nerdnic 5 лет назад

Andrew Frater yes.

@ljpotential2ba1st 9 лет назад

I wonder if you would be willing to help by explaining how I can convert a 8s in to a 7s for use on a e-bike? my ESC is 48v - 60v 1000w so my 2pcs of turnigy 8s 5.8Ah is over voltage. I'd also like to ask if I use a one way blocking diode from my DIY solar kit on the positive of batt harness at a set point and low voltage alarms then can I put packs of different capacity together? my zippy 2pc & turnigy 1pc lipo packs 7s x 2pc 5.8ah x 3 in parallel with 1pc nano-tech pack 5s x 3pcs 8Ah? The 7s 6p at 4.2 per cell = 58.8V & 5s 3p at 4.0 per cell = 60V. Thanks in advance, I know I said a mouth full but I hope its explained well, lanell in Cleveland.

@ShowHowCast 9 лет назад

lanell jackson All you need to do is remove one cell from the 8S. Just like I am removing one cell from a 3S you would have to remove just one cell from an 8S. That simple.

@ljpotential2ba1st 9 лет назад

Thanks I'll give it a try

@MrDavide1976 8 лет назад

Hi SHC!! I've just finished to do the job and everything went fine, thanks a lot for your instructional video. The only doubt i have concerns the lipo capacity. The lipo i converted was a 5100 mah. Now, the capacity still remains the same or i have to divide for three so instead of a 5100 mah lipo i have a 3400 mah. You know, these informations are crucial when you need to charge the lipo so you can set you battery charger in the right way. Thanks again, and looking forward any answer. See you SHC Davide (Italy)

@ShowHowCast 8 лет назад

Ciao Davide, the capacity will be reduced by 1/3 to 3400 mAh like you correctly pointed out. Good luck with your future projects! SHC

@James76767 8 лет назад

+ShowHowCast Actually no, each cell is 5100mah, this is because each cell is wired in series, not parallel, what you said is only true if it is a 1s3p pack, which is very unlikely. You will actually need to set the charger to a 2s if it was a 3s lipo, 3s if it was a 4s and so on.

@RandomNumber141 8 лет назад

You made a video on this but don't even understand it? Removing one cell that was in series will reduce the cell count while keeping the capacity constant....