This is a Li-ion Battery with 3400 MAH power supply. The more common battery holds 2600 Mah. This translates to more run time without having to recharge. Although it has a bigger power capasity it is the same size and weight as the more common types. It has a fuel gauge so you always know how much chargen is left on the battery. This battery is not only compatable with our own kelly Light but also works with Jerrys and Capps.  It can also be charged from a Jerrys or Capps Charger.