Battery Charging Cost Calculator
Calculate the electricity cost to recharge power stations, e-bike batteries, cordless power tools, and portable electronics, factoring in charger efficiency losses.
Battery Pack Size & Charger Efficiency
Battery Charging Energy Equation
Grid Energy Consumed (Wh) = [Capacity (Wh) × Charge % Delta] ÷ Charger Efficiency % | Cost = (Grid Wh ÷ 1,000) × Rate/kWh- Battery Capacity: Measured in Watt-hours (Wh), kilowatt-hours (kWh), or Amp-hours (Ah × Voltage = Wh).
- Charging Efficiency: Thermal heat losses in AC-to-DC charging adapters and battery internal resistance (typically 80% to 90% efficiency).
- Charge Delta: Percentage energy added (e.g. from 20% state of charge to 100% full).
Step-by-Step Worked Example
Calculation Steps:
How to Use This Calculator
Assumptions & Limitations
- Converts Amp-hours to Watt-hours using nominal pack voltage (Wh = Ah × V).
- Charger idle vampire draw after full charge is not included.
Frequently Asked Questions
How much does it cost to charge a smartphone or laptop for a full year?
A standard smartphone battery (approx 12-15 Wh) costs less than $0.01 per recharge, totaling about $1.00 to $2.00 in electricity for an entire year of daily charging. A laptop (50-70 Wh) costs about $5.00 to $10.00 per year.
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