How to check Nikon D40 Battery for compatibility?
The only way to see if this replacement part will work for you. Your Nikon D40 Battery's Part Number must be match with our Replacement Part number. If it's on the list, then our Nikon D40 battery will be compatible. (Model number is not good enough verify correct product)

Nikon D40 Digital Camera Battery Description:
Nikon D40 battery by is designed for use with Nikon D40 Digital Camera and more. Digital Camera batteries are precision engineered and rigorously tested for voltage, capacity, compatibility and safety to exceed original equipment manufacturer specifications..