Before deciding to take apart you're mouse, please visit the Anker 2.4G Wireless Mouse Troubleshooting Page. This would help you identify your problem.
Identification and Background
The mouse model and product name is found on the bottom side of the mouse. The item model reads on the top line and should read 98ANWSM-01UA. The model should read DS-2240 and the product name should read Anker 2.4G Wireless Mouse.