Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Capacity (Ah)

Rated capacity of the battery.

Charge current (A)

Constant charging current applied to the battery.

Estimate the hours needed to fully charge a battery at a constant current, including a documented 1.2 inefficiency factor that accounts for taper and losses. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Charging time (h)

Estimated time from empty to full including charging inefficiency.

• Battery capacity, state of charge, runtime, and aging depend on chemistry, temperature, discharge profile, cutoff voltage, cell balance, charge method, rate capability, self-discharge, and prior history. Nominal amp-hour or watt-hour ratings do not guarantee usable energy under every load.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Charge Current C-Rate

  Compute a safe constant-current charge rate for a battery from its capacity and a C-rate multiple.

• Battery Life Calculator

  Estimate battery runtime from rated charge capacity and constant load current: hours = mAh / mA. Real-world derating (Peukert effect, temperature, cutoff voltage) is not modeled.

• IGBT Gate Charge

  Estimate IGBT gate charge as constant gate-drive current times charging duration; actual current waveforms require integration.