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I have found a lantern, the batteries had burst, so the battery case useless, however it is a nice start to make an emergency lamp, it is 6 volt, used C cells so enough room, so 4 rechargeable cells and a relay will fit in the space. The idea is the relay holds the lamp off, so as soon as supply lost, it switches on. A simple battery eliminator will provide power, but how to stop the battery over charging is the problem.
After we left the NiCad era, I have not been involved with battery charging. It can be very slow, as long as the supply will hold the relay open, that's enough. 1 mA extra would maintain the batteries and in fullness of time recharge them, thinking 4 AA cells, so what voltage/current am I looking for?
After we left the NiCad era, I have not been involved with battery charging. It can be very slow, as long as the supply will hold the relay open, that's enough. 1 mA extra would maintain the batteries and in fullness of time recharge them, thinking 4 AA cells, so what voltage/current am I looking for?