Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

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?

share|improve this question
    
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

1 Answer 1

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.

Source.

share|improve this answer
    
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

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.