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Rechargeable Battery Charge Calculator

Calculate speed and time when loading a rechargeable battery (accu). Here you can estimate, how long a battery or powerbank with a certain charge loads or unloads. The charge should be indicated on the accu, commonly in mAh, milliampere hour. This value is often erroneously called capacity. The electric current depends on the power source, for USB this are 1.5 to 5 ampere. On the charger, the current should be indicated.

Time t:
Charge Q:
Electric current I:

Please choose the units. Enter two values of time current and charge, the third value will be calculated.

Formula: t = Q / I

Example: a rechargeable battery with 3200 mAh at a current of 2 ampere takes 96 minutes to load completely.

Accu is short for accumulator. This is an energy storage device, usually in the form of a battery, which can be discharged and recharged. This can happen very often; many accus indicate how many charging cycles they can withstand. In contrast, there are non-rechargeable batteries, which must be disposed of after being discharged once. The energy is stored electrochemically, which means that molecules are converted and electricity is generated or consumed in the process. The underlying reaction is a redox reaction; one substance is oxidized during discharging and another is reduced. When charging, it is the other way round. Many accus work on the basis of lithium, with various compounds being very well suited to this purpose. Sodium accus are also available; sodium is much more common and cheaper than lithium, but its electrochemical properties are inferior. Nickel-cadmium batteries used to be common, but cadmium is very toxic if it gets into the environment.

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German: Akku Rechner