Physics & Engineering
Battery Runtime Calculator
Estimate battery life based on capacity and load
Typical: 80-90% for Li-ion, 70-80% for Lead-acid
Runtime Formula
Runtime (h) = (Capacity × Efficiency) / Current
Energy (Wh) = Capacity (Ah) × Voltage (V)
Common Battery Voltages
Li-ion Cell3.7V
Li-Po Cell3.7V
Lead-Acid12V
USB Power Bank5V
E-bike Battery36-48V
About Battery Runtime
Battery runtime depends on the battery's capacity (measured in Ah or mAh), the voltage, and the device's power consumption. The efficiency factor accounts for energy losses during discharge, which vary by battery chemistry and temperature.
Disclaimer: Battery runtime calculations are estimates. Actual runtime may vary due to battery age, temperature, load fluctuations, and device efficiency. Consult manufacturer specifications for precise runtime.