Note: Real-world charge efficiency is not fixed and varies throughout the charging process based on a number of factors, including charge rate and battery state of charge. Here are efficiency ranges of the main types of rechargeable batteries ( source): Different battery types have different charging efficiencies This formula builds on the previous one by factoring in charge/discharge efficiency, which differs based on battery type. Some of the energy will be lost due to inefficiencies during the charging process. No battery charges and discharges with 100% efficiency. Formula 2įormula: charge time = battery capacity ÷ (charge current × charge efficiency) In this example, your estimated battery charging time is 1.5 hours. Finally, you divide battery capacity by charging current to get charge time. Now you have your battery capacity and charging current in 'matching' units. Next, you convert battery capacity from milliamp hours to amp hours by dividing milliamp hours by 1000. With that decided, you first divide watts by volts to get your charging current in amps. You know the charger's output voltage is 5 volts, so you settle on amp hours for battery capacity and amps for charge rate. But you're unable to find the battery's voltage, which you need to convert milliamp hours to watt hours. You consider watt hours for battery capacity and watts for charge rate. Let's consider the following scenario where the units are mismatched.įirst, you need to decide which set of matching units you want to convert to. Example 3: Battery Capacity in Milliamp Hours, Charging Rate in Watts In this scenario, your estimated charge time is 8 hours. Example 2: Battery Capacity in Watt Hours, Charging Rate in Wattsīecause your units are again 'matching', to calculate charging time you again simply divide battery capacity by charging rate. In this scenario, your estimated charge time is 10 hours. To calculate charging time using this formula, you simply divide battery capacity by charging current. Example 1: Battery Capacity in Amp Hours, Charging Current in Amps The formula itself is simple, but taking into account all the possible conversions can get a little overwhelming.
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