The original Magic Mouse comes with AA alkaline batteries ready to use. Some early users reported poor battery life, lasting around 30 days. This weakness may be the reason why Apple changed the battery type for the Magic Mouse 2 to an internal rechargeable lithium-ion battery. If your Apple wireless mouse is draining its battery, there is a simple solution.

If you experience abnormal battery drain, it’s possible that the batteries, not the mouse, are the culprit. In most cases, the Magic Mouse comes with Energizer batteries, a respected brand. However, it’s hard to know how long the batteries were sitting on the shelf before they were used. New, fresh batteries will likely last longer than the 30 days that some users got out of their first batch.

Battery life also depends on usage. The Magic Mouse goes into sleep mode when not in use, which extends battery life. Manually turning off the Magic Mouse when you're done using it, using the switch on the bottom of the mouse, should also extend battery life.

Another option to get the most out of your Magic Mouse is to replace the stock batteries with lithium-ion AA or rechargeable nickel-metal hydride batteries. Both should provide a longer life. The NiMH batteries have the added benefit of being rechargeable.