![]() ![]() 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. To longer shelf life for circuit device operations.Tip: If you’re solar charging your battery, you can estimate its charge time much more accurately with our solar battery charge time calculator. Thus, you can see how higher mAH values are more desirable in circuits, because it leads Power the circuit for 5 times as much as time as the AA battery cell can. Now the same circuit powered by a D cell battery rated at 10,000mAH can power the circuit for 10000mAH/200mA= 50 hours. With a AA battery rated at 2000mAH, it can power the circuit forĢ000mAH/200mA= 10hours. So, for example, let's say there is a circuit that consumes 200mA per hour. D cells provide current for a longer period of time than all others. Reason, D cells are physically bigger and are more expensive than C or AA batteries. A AA battery may have a mAH of 2000, while a D cell may have 10,000mAH. So batteries with higher mAH's are more desirable, because they can last for a longer period of time, since they have a higher current capacity.ĪA batteries usually have the shortest mAH life, while D cells have much greater mAH. The circuit's power requirements, how much current the circuit demands.īeing that the mAH is the battery's life in terms of current capacity, the more mAH's means the longer a battery can last, or the more current it can supply in a circuit. The mAH specification shows how long a battery will be able to last in a circuit, given Thus, our same example, of a 1900mAH battery can be used in the following ways, ![]() The product of the current consumed times the number of hours in use must equal Or for other circuits, it can supply 190mA of current for 10 hours, since 190*10=1900. In this case, the battery supplies 380mA forĥ hours, since 380*5=1900. Usually a circuit will not demand 1900 mAH of current all at once for operation.Ī circuit may instead only need 380mA of current for operation. Again, as an example, a 1900mAH battery can supply 1900mA of current to a circuitįor one hour, and then it will have used all of its charge. Again, mAH, iillliampere-hours, show how many milliamperes of current the battery can ![]()
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