as i said before 10.8 and 12v are the same identical batteries
as in any battery will have a working recognized level in this case each cell in a li-ion are 3.6v
when fully charged they are around 20% greater voltage at 4.32 dropping to maybe around 2.5v before the low voltage kicks in and stops operation
in a 10.8v you have 3 cells so 13v but finishing maybe 7.5v
the point is the recognized output is 10.8 but you can measure at different part off the cycle and call that the voltage but the power input and and output will be fairly identical for the same ah off batteries
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