Revive Nicad Batteries

[tw]

Trick to 'curing' NiCd typically was not performed as in that video. Most don't have a high current low voltage power source. We take a power supply and reverse apply voltage to an offending cell to accomplish same 'burnout'.

This problem is more often created by over discharging a series of batteries. Series as in four 1.5 volt batteries makes 6 volts. One weaker battery becomes so discharged that the other batteries actually reverse charge a weak cell. Then the weak cell shorts.

Solution was to drive a larger current in reverse across the battery to 'burn out the short'. Then charge each battery separately. Remember weak cells needs more energy. But if rechargeing then all in series, then a weak cell remains weaker. Batteries must be recharged seperately (or in parallel) so that the weak cell can accept more current - more energy.

The video did not show that concept and did not show why a weak cell would remain weak; to fail again.