2Ah

2Ah denotes a battery capacity rating of two ampere-hours. It is a measure of how much electric charge a rechargeable cell or pack can deliver at its rated voltage over time. The rating is nominal and depends on the chemistry, temperature, discharge rate, and end-of-discharge voltage.

One ampere-hour equals 3600 coulombs, so 2Ah equals 7200 coulombs. The stored energy also depends on voltage, with energy in watt-hours given by Wh = Ah × V. For example, a 2Ah battery with a nominal voltage of about 3.7 V stores roughly 7.4 Wh.

In practice, the runtime you get from a 2Ah pack depends on the load. At the stated rating, drawing 2 A would theoretically last about one hour, but real-world runtime is affected by discharge rate (Peukert’s effect), temperature, and the device’s voltage cutoff. The capacity figure is specified under certain test conditions, and actual performance can vary.

Applications of a 2Ah rating span a range of consumer and power-using devices. You’ll see it on lithium-ion, nickel-metal hydride, and lead-acid cells and packs used in portable electronics, power tools, RC models, and some small electric vehicles. The 2Ah label indicates capacity but not instantaneous power output or runtime under all conditions, since voltage and current profiles influence performance.

Charging and safety considerations include using a charger appropriate for the battery chemistry and capacity. A common guideline is a charge rate around 1C (2 A for a 2Ah cell), but higher rates shorten life. Always respect recommended voltage limits, avoid deep discharge, and store and handle batteries in suitable conditions.