I have often seen schematics of Joule Thief chargers for use in charging Ni-MH rechargeables from used alkaline cells. The idea is to boost the voltage of the used alkaline cell up to high enough to get current the flow into the Ni-MH cell. One setback is that conventional JTs are only 50% efficient, so
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I culled through a bunch of AA and AAA cells to find any that were dying or nearly dead. If I found any that were below 1.2 volts they were considered dying, and below 1 volt, they were considered dead. I then put some of the dead ones into Joule Thiefs to suck out the
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I connected a AA cell to a “Pigeons Nest” flasher more than a year ago, and used it as a trip hazard marker when it’s dark. The cell was a Kirkland brand from Costco. This had been running up until the end of August, even though I had noticed some ‘hair’ building up on one
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