Re: 90V ht battery
The simple and lethal way to charge the whole battery is to apply mains via a suitable resistor and a diode or bridge. Keep the current well down to avoid overcharge problems. Probably something like C/50 or 4mA so the charge time will be correspondingly long. A 33K resistor should be about right and will not dissipate much more than a watt.
Reitererating that this a nasty and dangerous way to do the job but it should work. I think NimH will tolerate C/50 indefinitely but ought to check data sheets before trying.
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