I'm wondering if I have the formula down correct..

Scanner with a plug in 1000 mah charger. 4 2300 mah batteries. 4 *
2300 = 9200 mah. 9200 (total mah of batteries) / 1000 (mah rate of
charger) = 9.2. So 9.2 hours? Am I using the correct formula?


Batteries are usually in series. The current is the same in a series
circuit. If the charger is a constant current charger (which I would be
surprised if it was) the charger would be putting out 1000 ma and it would
take just 1 X 2300 devided by 1000 for a total of 2.3 hours . Then you have
to allow for about a 10% overcharge time as slightly more power is put back
in the battery than taken out. BTW I am asuming the charger is rated for
1000 mA and not 1000 mAh.