12-12-11, 09:02 PM
It doesn't matter if you are connecting them in series other than the fact that if one goes flat before the other then you'll get no volts at all. They only have to be matched if connected in parallel as one would go flat first and the other would try to charge it.
You're sums are right though, so drawing 225mA per battery means they will last longer than running off one 12V battery. Assume the batteries are 60Ah they will last for 60/0.225 or 267 hours in theory although I doubt you'll get that in practice if the batteries aren't perfect. You'll still get a long time though.
You're sums are right though, so drawing 225mA per battery means they will last longer than running off one 12V battery. Assume the batteries are 60Ah they will last for 60/0.225 or 267 hours in theory although I doubt you'll get that in practice if the batteries aren't perfect. You'll still get a long time though.