Technically, I suppose it's 8.4 Volts - but then we haven't had the 30 page discussion on non-recharge-ables also not having a permanent output voltage of less than 9 volts - 6 cells of 'nominally' 1.5V!

Nominally - because the voltage varies with the state of charge remaining in the battery - when it's 'flat' it will have well under 1.5V per cell!!!!

As I said earlier "Which means for us ignoramuses, that the circuit may not work correctly if it cannot run down to the lower voltage - definitely a good chance of a lower level output and perhaps more distortion at the every least."


Suck it and see - you are unlikely to damage the circuit by under-voltage. If it works, fine - but note form that Wiki link that 'recharge-ables' have far less life between recharges than nonrechargeables do for their 'natural life'. So you will need to recharge more than than you would have needed to replace the other type - and also ALL recharge-ables lose charge by a small amount every day when standing unused anyway!. So you should always have a spare rechargeable to pop in while one is being recharged.