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Recycling Two Bad 3s Lipos

Snarls

Gravity Tester
Mentor
#1
I have two 3s 2200mAh lipos that have ended their life early. One has a cell that is puffed and appears non existent, and the other has a cell that discharged itself to 0v without use. The other two cells in each battery appear to be fine and stable. I was wondering if it would be a good idea to take the good cells and make a 4s 2200mAh pack. One issue is that one's a Turnigy 30-40c and the other is a Zippy 40C. Is this a difficult/dangerous task or should I try for 2 2s 2200mAh packs instead, or just toss them? They've been bad for probably over 8 months so I know their stable in their condition. Thanks!

For Reference:
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#2
No problem with either option but you will need a balance plug for a 4s. You can probably get away with the 3s balance plugs on a 2s depending on the charger.
 
#3
There are quite a few uses for Lipo cells. I would just take them apart, properly throw away the bad cells, and storage charge the good cells. I took apart a bad 2200 3s and made it into a 2200 2s for my Hitec Aurora 9. The stock nimh was awful compared to the lipo.

Be very careful when taking them apart to not short anything.
 
#4
I cringed when I thought about taking apart a LiPo. But as long as you do it in a safe environment (I.e. not on your kitchen table) I don't see why you couldn't. But you would have to be very diligent not to short anything or cut a cell like ExperimentalRC stated. Seems like a lot of work for a $10 battery though in my opinion. :) I'd take it to your local electronics shop (Best Buy for instance) and recycle it.
 

Tritium

Amateur Extra Class K5TWM
#5
It is no big deal to reduce or increase cell count in a LIPO as long as good safety is observed. Make absolutely sure that you have a quick disposal route available in case something "dumb" is done and the cell's start to melt down. Note the Smoke from a LIPO meltdown is EXTREMELY toxic so if accident happens stay upwind of the battery.

"Toxic gases (HF, PF6 ) will be formed if cells or battery are involved in a fire. Cells or battery may flame or leak potentially hazardous organic vapors if exposed to excessive heat, fire over-voltage conditions. Damaged or opened cells or batteries may result in rapid heat and the release of flammable vapors."

Thurmond
 
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