This is a battery cover for a remote that came with a Motorola VIP1963 box.
I only had parts of the original cover so this model was some guess work.
The first model have rounded corner at the bottom for a better fit and two tabs at the top, the securing tab is slightly longer and the second tab is to make it easier to remove, more annoying to insert compered to the other model.
The second original model is the same but without rounded corners at the bottom and one slightly shorter tab for securing it