Voltages for 7AH, SLA batteries
So I've read all on the web about the voltages of a lead acid battery, and according to sites like This One
the battery should be full at 12.69v or so. The only thing is I'm getting 13.02v on one SLA, and 13.08v on another. One of the batteries is brand new, and the other is out of a UPS. Are these batteries badly overcharged, or am I just really ignorant and can't find a simple site listing SLA voltages :) The batteries were not connected to anything for about 12 hours before I took the readings, and I have tested the multimeter I used, and it is accurate.
If it helps, the battery says:
Constant voltage charge(25C)
- Cycle use: 14.5-14.9V
- Standby use: 13.6-13.8V
- Initial current: 2.1A
Any advice / help would be greatly appreciated!
PS) The main project is powering a computer with these batteries. I've done that so far and it draws only around 1.8A, so hopefully it could last for quite long! (~5 hours or so)