The DMW-BLC12E is a replacement battery for the Lumix GH2. It has a battery life of around 330 images, dependent on which lens you are using. A replacement battery is essential for those who are likely to be using their Lumix camera for an extended period of time. and where charging the battery is not an option. It is also a more convenient and compact way of carrying more power than carrying the charger. especially when storage space is limited e.g. when going on holiday, or with limited space in your System Bag.