I have a Magic Trackpad, Magic Mouse and the Apple Wireless keyboard. They work fine. Two days ago, doing my part for the environment, I changed all their batteries to Apple rechargeable batteries.

Today I noticed that the battery level meter for all three devices report the wrong battery level. The trackpad reports 93% charge, the keyboard 75% charge and the mouse 65% charge. This can't be right; these are fully charged new batteries. They can't possible drop that much within 48 hours.

Has anyone else encountered this problem? And are there any solutions?

  • Did the devices report 100% full batteries when you put them in? Do you have another device that could check battery levels? – Daniel Beck Nov 2 '10 at 15:43
  • The original non-rechargeable batteries on the three devices were at 99% to 100% when they were swapped with the rechargeable ones. – GeneQ Nov 2 '10 at 17:17

What kind of battery are they? And did you charge them, or do you just assume they're charged when you buy them? This is why I ask:

NiMH and NiCd batteries self discharge at a MUCH faster rate than alkaline batteries. In fact, at "room temperature" (about 70 degrees F) NiMH and NiCD batteries will self discharge a few percent PER DAY. Storing them at lower temperatures will slow their self discharge rate dramatically.


  • They are NiMH batteries. They are from Apple : apple.com/battery-charger They were charged (by me) for the duration as suggested by Apple before use (i.e. until the LED on the charger turned green). – GeneQ Nov 2 '10 at 17:18
  • Apple's batteries are rebranded Sanyo Eneloops which don't self-discharge quickly. In a drawer, they'll retain 80% of their charge even after a year. – Dave Jun 4 '12 at 22:34

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