Battery Life Calculator
Battery Life is evaluated from Battery Capacity, Load Current and Efficiency Factor. The calculation reports Estimated Runtime, Estimated Runtime and Battery Energy.
Results
About the Battery Life Calculator
The calculator uses a multi formula configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.
Formula basis:
t (hours) = C (mAh) / I (mA) x efficiency
t (days) = t (hours) / 24
Energy (Wh) = C (mAh) x V / 1,000
Power (mW) = I (mA) x V
Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.
Formula & How It Works
The calculation applies the following relations exactly as recorded in the metadata: t (hours) = C (mAh) / I (mA) x efficiency t (days) = t (hours) / 24 Energy (Wh) = C (mAh) x V / 1,000 Power (mW) = I (mA) x V Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.
Worked Examples
Example 1: Smartphone Daily Use
Inputs
With Battery Capacity = 3,561, Load Current = 300, Efficiency Factor = 85 and Battery Voltage = 3.87 as the stated inputs, the result is Estimated Runtime = 10.09 hours, Estimated Runtime = 0.42 days and Battery Energy = 13.78 Wh. Each value corresponds to the declared output fields.
Example 2: Home UPS Backup — Internet Router
Inputs
With Battery Capacity = 7,200, Load Current = 800, Efficiency Factor = 70 and Battery Voltage = 12 as the stated inputs, the result is Estimated Runtime = 6.3 hours, Estimated Runtime = 0.26 days and Battery Energy = 86.4 Wh. Each value corresponds to the declared output fields.
Example 3: IoT Temperature Sensor — 1 Year Target
Inputs
With Load Current = 0.5, Efficiency Factor = 90 and Battery Voltage = 3.6 as the stated inputs, the result is Estimated Runtime = 0 hours, Estimated Runtime = 0 days and Battery Energy = 0 Wh. Each value corresponds to the declared output fields.
Example 4: Electric Bike Battery Range
Inputs
With Battery Capacity = 17,500, Load Current = 5,000, Efficiency Factor = 85 and Battery Voltage = 48 as the stated inputs, the result is Estimated Runtime = 2.98 hours, Estimated Runtime = 0.12 days and Battery Energy = 840 Wh. Each value corresponds to the declared output fields.
Common Use Cases
- Calculate how long a phone battery lasts with a specific app
- Find runtime of a UPS backup battery under load
- Determine battery pack capacity needed for an IoT sensor