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If a battery of open-circuit voltage
EB has a loaded voltage VL
when supplying load current IL, the
battery internal resistance RB is:
RB = (EB - VL)
/ IL
The load voltage VL
and load current IL for a load
resistance RL are:
VL = ILRL
= EB - ILRB = EBRL
/ (RB + RL)
IL = VL / RL
= (EB - VL) / RB = EB
/ (RB + RL)
The battery short-circuit current Isc
is:
Isc = EB / RB
= EBIL / (EB - VL)
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