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voltage....
Karl, with all due respect that is getting a little pedantic: but if we are; a fully charged battery can have a terminal votage of anything up to 14.8V (sometimes even higher, depending on the charger) - but this is invariably an open circuit (no load) senario. I spent a great deal of my life doing load performance tests on lead acid batteries for telstra as well as living with wind and solar electricity generating systems: jinxsta will have absolutely no problems substituting his 12V 7aH battery for the 8 "C" cells; and ac/dc motors of the types used in drives have a relatively high overload tolerance. If you read my post you will note my precaution re using (very) badly regulated battery chargers and operating the drive from a battery hooked up to such a device - though your suggestion of diode protection to gaurantee against accidently wiring it up with reversed polarity is a good comment.
Cheers, Darryl.
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