How do I calculate Battery Charge Time?

To calculate Battery Charge Time: Enter Battery capacity C, Current depth of discharge, Charger current and other values. Click Calculate. INDUGRID computes the result instantly using the formula: t_charge = (C x DoD) / (I_charge x eta_charge). No registration required.

What units does the Battery Charge Time calculator use?

The Battery Charge Time calculator uses the following units: Ah, %, A. SI units are used by default.

Is the Battery Charge Time calculator free?

Yes. The INDUGRID Battery Charge Time calculator is completely free, requires no account or login, and works on desktop and mobile browsers.

Battery & DC Systems

Battery Charge Time

Calculate charge time for lead-acid, AGM and lithium batteries based on charger current and battery capacity.

Units:

in LinkedIn

💡Lead-acid charging: bulk phase (0-80%) at constant current, absorption phase (80-100%) at constant voltage. Full charge takes 1.2-1.5x the theoretical time. Never charge at more than C/5 for lead-acid.

t_charge = (C x DoD) / (I_charge x eta_charge)

Input

Battery capacity C iNominal battery capacity (C20 rate) in Ah.

Current depth of discharge iHow discharged the battery is. 100% = fully empty.

Charger current iConstant charge current. Max: C/10 for lead-acid, C/2 for LiFePO4.

Charge efficiency iCoulombic efficiency. Lead-acid: 80-90%, Li-ion: 95-99%.

Battery chemistry iChemistry affects charge algorithm and efficiency.

Result

Ah to restore [Ah] —

Theoretical charge time [h] —

Estimated actual time [h] —

Charge C-rate [C] —

Max recommended current [A] —