Re: battery discharge
If the voltage difference is significant (i.e. one holds a charge at 12.2v, the other at 13.2v) you have a defective or damaged battery. Having the two batteries in series is not good. The damaged battery is already taking down the good battery. If/when either battery fails to perform and needs to be replaced, you need to replace both of the batteries, not just the one. The one battery that appears to be good may fail at any time, without warning.<br /><br />I am going thru this very thing with brand new batteries on my 24v starting system. One will not hold a charge to spec. Altho only required to replace the one battery, manf insisted on replacing both for the reason described above. Said they don't want me to experience any problems 6-mos from now.
