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Lithium cells are completely different technology then NiCads. The nominal voltage on a nicad is 1.2 volts, lithium is 3.7. The biggest problem with lihtium is that if you overcharge them , they short and catch fire (ask Boeing) . You are charging 5 series connected cells with 20 volts, one cell...

the easiest way to get rid of voltage without adding resistors and thus generating heat, is to insert silicon diodes in series with the power source, each diode drop is about 0.7 volts. For currents less then 1 amp use a 1n4001, for upto 2.5 amps use 1N5000 series. To drop 2.1 volts wire 3...

There is no reason to remove the exisiting receptaclle AS LONG AS you only use one at a time. The first pots was correct, use a small 4 breaker subpanle to power your 120 volt outlets, BECAUSE the 120 volt outlets are rated at 20 amps at best AND if you get a short the 30 amp breaker will not...