It's a very good battery but I think you pay a premium for the Nikon name. However there seems to be a shortage of reliable aftermarket batteries for Nikon cameras so if you want assurance that your battery is going to work you are forced to buy Nikon.
This is a high-capacity Nikon EN-EL3e 1500mAh rechargeable lithium-ion battery for Nikon Digital SLR Cameras. It features lithium technology which ensures maximum battery life and maximum power. This enables consistent high speed shooting more flash shots image review and playback. It also features no memory effect letting you recharge partially drained batteries without reducing performance. It is a Genuine Nikon brand battery pack. When used with the Nikon D200 & D80 this battery also features a handy real-time fuel gauge system display that shows remaining charge by percentage number of shots since last charge and overall battery status.