Sometimes it’s hard to figure out how much of your battery is remaining just by looking at the voltage. A 12Volt battery is actually at 100% charge capacity when it has a voltage of 12.6 Volts (for a wet cell) and 12.8 Volts (for an AGM).

 

Here is a graph showing 12Volt Battery Voltage & Percentage of Battery Remaining for both Wet Cell batteries and AGM batteries.

 

% – AGM – Wet Cell
100% – 12.8 – 12.6
90% – 12.7 – 12.5
80% – 12.6 – 12.42
70% – 12.5 – 12.32
60% – 12.3 – 12.2
50% – 12.1 – 12.06
40% – 11.9 – 11.9
30% – 11.7 – 11.75
20% – 11.5 – 11.58
10% – 10.7 – 10.5
0% – 10.7 – 10.5