![]() ![]() Or they may be given in milliamp hours and watts. Your battery capacity may be given in watt hours and your charge rate in amps. charge time = battery capacity (mAh) ÷ charge current (mA)Ĭharge time = battery capacity (Wh) ÷ charge rate (W)Īnd sometimes, your units are mismatched. So you may also see the formula written with different unit combinations. ![]() And your battery charger may tell you its power output in milliamps (mA) or watts (W) rather than amps. However, battery capacity can also be expressed in milliamp hours (mAh), watt hours (Wh) and kilowatt hours (kWh). So you'll often see this formula written with these units: charge time = battery capacity (Ah) ÷ charge current (A) Most often, your battery's capacity will be given in amp hours (Ah), and your charger's charge current will be given in amps (A). The easiest but least accurate way to estimate charge time is to divide battery capacity by charge current. Formula 1įormula: charge time = battery capacity ÷ charge current I start with the simplest and least accurate formula and end with the most complex but most accurate. 3 Battery Charging Time Calculation Formulasįor those interested in the underlying math, here are 3 formulas to for calculating battery charging time. Click "Calculate Charge Time" to get your results. If your battery is dead, you'd enter 0.Ħ. For instance, if your battery is 20% charged, you'd enter the number 20. Optional: Enter your battery state of charge as a percentage. Select your battery type from the list.ĥ. Depending on the combination of units you selected for your battery capacity and charge current, the calculator may ask you to input a voltage.Ĥ. If the calculator asks for it, enter your battery voltage or charge voltage. The unit options are milliamps (mA), amps (A), and watts (W).ģ. Enter your battery charger's charge current and select its units from the list. The unit options are milliamp hours (mAh), amp hours (Ah), watt hours (Wh), and kilowatt hours (kWh).Ģ. Enter your battery capacity and select its units from the list. We also have many other calculators.Tip: If you’re solar charging your battery, you can estimate its charge time much more accurately with our solar battery charge time calculator. Got your fix of the hours difference calculator? There are many more where that came from. I hope you enjoy the minute duration tool and you find it useful for all your minute math. Instead of casually saying "just five more minutes", you can use the tool to show the relationship between two times. It's also very useful when exploring time with children. The minutes calculator is useful if you are paid in fractions of an hour, for example in 15 or 30 minute increments. This tool along with the hours calculator are useful to compute the length of a shift. If the start time is later than the end time it will do the math assuming the time frame passed midnight. The tool will assume the two times fall within the same 24 hour period. ![]() What if the time-span crosses midnight? That is, what if the start time is later than end time? Is Noon in the AM or PM? What About Midnight?īy tradtion, 12:00 PM is noon and 12:00 AM is midnight.
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