When we saw [Max.K]’s automatic NiMh battery charger float past in the Hackaday tips line, it brought to mind a charger that might be automatic in the sense that any modern microcontroller based circuit would be; one which handles all the voltages and currents automatically. The reality ...
The load might be something like a light bulb, a motor or an electronic circuit like a radio. The internal workings of a battery are typically housed within a metal or plastic case. Inside this case are a cathode, which connects to the positive terminal, and an anode, which connects to ...
Here's the hack: Place the dead battery on the table next to a good one that is fully charged. Connect the corresponding terminals on each battery to each other with 14-gauge copper wire. Tape the wire to the terminals, and wait for one or two minutes. When you remove the wires and ...