Re: 90V ht battery
Re being slightly on either side of 90v this wont make the slightest difference as you are only talking a few percent either side, well within manufacturers tolerance limits.
As for charging them well I think I would go for either a half wave diode via a current limiting resistor around 3200 ohms but you would need an 8 watt resistor.
Alternatively why not use a capacitor instead and save energy, if my calculations are right a 1uf capacitor would be near the mark but it must be non polarised, definately not an electrolytic.
val33vo
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