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. ![]() So if I use the PD converter to charge to 13.Tip: If you’re solar charging your battery, you can estimate its charge time much more accurately with our solar battery charge time calculator. This lower charge state will not damage your battery, but will eliminate most of the advantages you paid for."įrom one of Will's videos he was saying to increase the life of lithium batteries keep them charged between 10/20 to 80/90 percent. The faster charge rate of Lithium means that in the Boost Mode it will reach this 13.8-Volt point after only a few minutes of recharging and then the charging current will drop to ZERO AMPS and will not add any additional charge to your Lithium Battery. ![]() ![]() The PD9200, PD4000 & PD4500 Series Charge Wizard will initially jump to 14.4-volts in the Boost Mode when first connected to 120 VAC power and will remain there until the battery voltage reaches 13.8-Volts, then automatically drops down to the Normal Mode of 13.6-Volts. The Normal Output voltage of the PD9200, PD4000 and PD4500 Series voltage provides only 13.6-volts and a full charge voltage for Lithium needs to be 14.4 – 14.6 Volts. "Yes, if you are willing to live with an expensive battery that is only partially charged. I have a Progressive Dynamics converter and here is a quote from one of their FAQs in response to question of using the lead/acid charger to charge a lithium battery: I'm an RV owner and still in the process of learning about Lithium batteries.
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