ORIGINAL: rctech2k7
BTW, the actual current is based on the actual voltage of the charger less initial battery voltage then devided by their combine resistance.
Depending on the condition of your battery, considering healthy battery at fully drain, devide the mAh capacity by the charging rate of mA will give you time in hours then multiply it with factor that base on your charging rate. Usually 1.25 would give you 20% of energy to compensate loss on charging. Make sure that rate after full charge or charging current would not heat up your battery for a long time.
let's see if I got it right... I have this 2000 mAh battery (it is healty ), then I have this charger that states a 80 mA output, then following your formula, it should be 2000/80 * 1.25 = 31.25
so I have to charge the battery for 32 hours assuming it is discharged at 4.4 V
am I correct?