Peukert’s law, however, explains why that is not true for lead-acid batteries and the more you draw from that type of battery the less charge time is available. Taking our 5Ah battery above it’s easy to say that we can draw 5 amps for 1 hour – 10 amps for 30 minutes – or 20 amps for 15 minutes, in a linear calculation, and in fact we can with a lithium ion battery. ![]() Lithium-ion batteries have a self-heating characteristic that raises voltage and counteracts the dissipation of power due to internal resistance. Peukert’s law says that a battery’s amp hour rating is reduced disproportionately as more current (amps) is drawn from it. You may hear something called Peukert’s law, which is applied to lead-acid batteries (the battery in your car), falsely applied to lithium-ion batteries like the ones shown in this article and video. You’ll be able to use your drills, circular saws, and jigsaws longer before the battery runs down. Just think of amp hour as a way to know that one battery holds more of a charge than another. We say a capable charge because in the real world, you never meet those ideal conditions. ![]() Now, that’s under ideal conditions, perfect temperature, no vibration, and consistent power. Theoretically, we can draw 5 amps, continuously, for 60 minutes before our 5 amp hour battery is drained. Usually, if a battery has at least a 4Ah capacity, it will be prominently displayed somewhere on the battery like the 5Ah in the picture.Īmp hour describes the capable charge of a battery. Amps are used to describe amp hour, but they are different units of measurement. What is Ah (Amp hour)?Īmp hour (Ah) is a unit of measurement that has nothing to do with power and it’s a totally different unit than Amp (Ampere). ![]() Wondering what in the world Ah (Amp hour) means? Is a 5Ah battery more powerful than a 2Ah battery? Does it last longer? The video above and this article give a quick and basic explanation of Amp hour and how it affects your cordless tools.
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