Battery Duration Calculator
Calculate how long your battery will last based on capacity and power consumption
Battery Specifications
Power Consumption
Battery Duration Calculation Information
This calculator determines how long a battery will power a device based on the battery’s capacity and the device’s power consumption. The calculation considers various factors including battery type, efficiency, and safe discharge limits.
Capacity Units Explained
mAh/Ah: Measures electric charge capacity. Higher values mean longer runtime at the same current draw.
Wh/kWh: Measures energy capacity. Accounts for both current and voltage, providing a more complete picture of stored energy.
Battery Types & Characteristics
Lithium-ion: High energy density, 80-90% discharge depth recommended.
Lead-acid: Lower cost, 50% discharge depth for longevity.
NiMH: Good for high-drain devices, 80% discharge depth.
Efficiency Factors
Real-world efficiency is typically 80-90% due to internal resistance, temperature effects, and conversion losses. This calculator accounts for these factors to provide realistic estimates.
Discharge Depth Impact
Deep discharge can damage batteries and reduce lifespan. The calculator uses safe discharge limits: Lithium-ion (80%), Lead-acid (50%), NiMH (80%), Alkaline (90%).