Battery charge time calculator help

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Efficiency loss Not all of the power applied to a rechargeable battery is put into the battery. Some of the power is lost e.g. as heat or battery inefficiency itself. This energy loss results in a longer charging time.

Although 20% and 30% are commonly observed in practice, 10% and no loss are virtually unheard of so take this in to account when charging your batteries.

You may need to slightly adjust charging time dependant on how the battery performs in use. If after charging a battery for the recommended time you experience short use time, it is possible efficency loss is above 40% and you need to attempt to find the reason by changing the charger or replacing the battery.

Keep in mind that a battery that is only partially discharged needs to be recharged in less time. The calculation is based on a fully discharged battery.