This is a dedicated Li-ion battery, supplied with the DP1 camera.
Reviewed by 3 customers
I used the BP-31 in a Sigma DP2s, which was carried as a second or even a third camera. The bat preformed well, but wss never subjected to either extreme weather or high volume (+400 images) shooting.
This is the same battery came with my sigma DP2, not generic. The photo is wrong. The price is the best I can find.
Must have for travel with the DP1. One battery runs out too quickly. Good price for a manufacturer-branded battery.