A rechargeable battery stores electrical energy and can be recharged and reused after it has been discharged - similar to a car battery.
With proper use and charging, rechargeable batteries can often be charged hundreds or even thousands of times.
Rechargeable batteries such as NiMH batteries provide a relatively stable voltage of around 1.2 V during use. This means they deliver consistent performance almost until they are empty, after which the voltage drops quickly and the battery needs recharging.
Well-known rechargeable battery brands available at Elfa include Saft, Tadiran, and GP Batteries.