by Larry Ludwig » Thu Aug 05, 2004 9:21 pm
It can be fun, most nicads these days it seems... come without any markings. I bought some today at my favorite electronic shop and of course... no markings... well... nothing indication voltage, mah... nothing. Oh well. You are usually safe in assuming that AA sized nicads (not alkaline AA) are 1.2 volts... hence a great deal of transmitters use 6 cells for 7.2 volts. Notice how many battery packs you see for R/c cars etc that are 7.2... same reason.
I got mad at a junk pile HiTech radio and I have been using it with a 12 volt gel cel trying to blow it up... no luck... it still works fine.. and might even have slightly better range. [:0]
Most receiver packs use 4.8 or 6 volts, I have used the voltage interchangeably for years, but you might want to look up your system specs at one of the major online hobby dealers that sells your particular model of Futaba. I would imagine that 6 volts would be plenty, 4.8 is what they come with normally.