FormOptik flashlights

About rechargeable batteries
Capacity

When buying rechargeable batteries, pay attention to the mAh rating. Manufacturers sometimes sell batteries of the same brand name and in the same packaging, but with different mAh ratings that can differ much. Batteries that look nearly identical sometimes have very different capacities. It means that some of the manufacturers are just giving you a possibility to choose the price of the batteries Suiteable for you. So it is important to read the mAh rating that manufacturers usually print for you both on the packaging, and on the battery. If the mAh capacity is not listed on a rechargeable battery, then beware. The capacity is not usually printed on single-use batteries.


What's a mAh?

The capacity of rechargeable batteries is rated in milliampere hours. One milliampere hour (mAh) is one thousandth of an ampere delivered for a duration of one hour. In the case of AAA, AA, C, and D batteries, this energy is delivered at somewhere around 1.5 volts. If one of these 1.5 volt batteries had the potential to provide one thousandth of an amp for one hour, we would say that it has a capacity of 1 mAh. If it could provide 2,000 milliamps for one hour, or 1 milliamp for 2,000 hours, it would be called a 2,000 mAh battery. Amperes can be thought of as the amount of electricity in motion, or an amount being delivered at any instant. Voltage or volts can be thought of as force. The voltage coming from the battery is roughly constant. It stays in the neighborhood of 1.5 volts. However, the amperage utilized or drawn by any particular electrical device can vary from device to device. For example, wall clocks and remote controls use just a tiny amount, and digital cameras use a comparatively larger amount, although in both cases only tiny fractions of an ampere are used, hence the measurement of thousandths of Amps.