revive Nicd battery

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Yes it does work on a cell by cell basis. It helps to have a good charger and balancer setup like was used by RC racers before LiPo took over. NiCads are very old technology and were replaced by NiMH before lipo. New cells are pretty cheap if you want to rebuild the packs.
 
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Playing with high current rejuvenation for 45 years. Works for a time. Cell is always on its way out.
 
I pulled apart a weedwhacker 2 stroke motor, mounted the shaft and magneto in a drill press...



Have brought a few NiCd back with it....100% success rate, but I don't like NiCd...
 
You can sometimes shock a nicad back to life for awhile
by using very short pulses of high current but it is also a risky practice.
Once nicads are left discharged for years, they likelywill never return.
 
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