Varta 20396 is a rechargeable NiMh AAA battery, typically used for powering many computer, household and office appliances. It has a voltage of 1.2V and a capacity of 800mAh. It is a high quality battery that is both long lasting and reliable in providing a good amount of current. Additionally, this battery is rechargeable, meaning it can be recharged and used multiple times, making it very cost effective. It is also very light weight and small in size, making it perfect for powering small appliances like flashlights or remote controls. Furthermore, it is leak-proof and shock-proof, making it a good choice for everyday use.