I was looking to replace the B500BZ that came with the phone, hoping that this BE battery would be its equivalent, and it was. The BE battery has the same dimensions and number of contacts as the BZ. One caveat: the first few days of use, the new BE battery ran down very quickly and would not hold a charge. However, after a few more days of full-charging, it held its charge, and its charge was consumed at a rate that was appropriate for how and how often the phone was used. Incidentally, product information that accompanied the battery advised to charge the battery overnight for the first 3-5 days. And it was after about five days that the battery started to work and act like a new battery. So apparently the battery needed to be conditioned for several days to establish its capacity and power storage. Wished we had read the product information first. We would have saved a lot of angst about having purchased what we first thought was a crap battery. Again, the battery first needed to be conditioned (go figure!). Since then (many weeks have passed), the battery has worked fine.