profdant139 wrote:
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As to the voltage when fully charged, this is my third set of marine deep cycle batteries in eleven years of camping. In every case, it reads around 13.5 while charging. When I unhook from the charger, it reads around 12.9. After a day of sitting around, the batteries are at 12.7. This is true when they are new and when they are well-used. Maybe that is not typical of what others are experiencing, but I can tell you that based on a small sample of six batteries, that is what the numbers say.
Back when I had 27s, I did a little test on surface charge decline.
Posted: 11/29/10
Separated batteries and let sit.
Voltages by batteries No 1,2,3 where 1 and 3 are from 5/08 and 2 is from 3/10.
* Was 13ish volts next day after removing charge to 16+ *
so start with day after that by Day number:
1- 12.86, 12.87, 12.89
2- 12.83, 12.82, 12.88
3- 12.80, 12.78, 12.86
4- 12.79, 12.76, 12.85
5- 12.78, 12.74, 12.85
6- 12.78, 12.74, 12.84
7- 12.78, 12.74, 12.84
8- 12.77, 12.73, 12.83
9- 12.77, 12.73, 12.83
