"Full charge" specific gravity measured with a hydrometer is around 1.265. That's the best way to monitor the battery, by measuring the strength of the acid. Most parts stores will have a hydrometer in stock, or there's always a few of them on Ebay. They're very inexpensive, and there's no better way to check any battery with removable cell covers.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!