How Long Does It Take To Recharge a Good Battery?
When a battery is discharged, more power has to be replaced due to loss. However, some of the power is converted to heat and lost due to the resistance in the cables, connectors and elements within the battery. For most batteries that are discharged less than 20% of their full capacity, an estimate of time is the amp hours to be replaced divided by the current output of the charger. For example, a 40 amp hour battery with a 5% discharge would require approximately two amps hours to be replaced. Using a five-amp charger, it would take approximately 24 minutes (2 amp hours/5 amps x 60 minutes) to recharge the battery. A 10-amp charger would take approximately half the time or 12 minutes. For batteries that are discharged more than 20% of their full capacity, an estimate of time is twice the amp hours to be replaced divided by the current output of the charger. For example, a 40 amp hour battery with a 95% discharge would require approximately 38 amp hours to be replaced. Using five-amp c
