How long should magic mouse batteries last?

Discussion in 'Mac Accessories' started by jerwin, May 7, 2017.

  1. jerwin macrumors 68020

    Jun 13, 2015
    My magic mouse is several years old; it came with my 5k imac. For the lifetime of the mouse I've been replacing the double A on a weekly basis. I've been using rechargeable duracells. Some days ago I got fed up and decided to go for some eneloops-- figuring that constant charge cycles had worn down the duracells (which have been derided as bargain basement anyway). But after a couple of days with the eneloops, I'm already down to 44 percent.

    Is this normal? Is there a firmware update for this mouse? Or is this just a fact of life?
  2. dwfaust, May 7, 2017
    Last edited: May 21, 2017

    dwfaust macrumors 603


    Jul 3, 2011
    Is it "normal"? What's normal? Your usage may be vastly different from mine... and both of our usage will be different from someone else... I have been using the Eneloop batteries in the Magic Mouse connected to my MBA. I also have a MM2 connected to my 5K iMac.... I'd imagine that they last 2-4 weeks... and remember 44% is still a good charge - just barely below half way...

    FWIW, it's low battery is more annoying with the MM2. On the original MM, you just swap out the batteries and you're on your way. With the MM2, you have to turn it over and plug it in, so it's not usable while charging... on the plus side, I can add about 20-25% charge in a few minutes to finish out the day and then charge it completely overnight.
  3. AppleSmack macrumors regular

    Jun 30, 2010
    I've worked in studios where the batteries are replaced every few months… this is impressive considering they used whatever rechargable batteries were available and with heavy use through the work day.
  4. ZapNZs, May 9, 2017
    Last edited: May 9, 2017

    ZapNZs macrumors 68020


    Jan 23, 2017
    I'm far from a battery guru so, FWIW, in my personal opinion...

    It can be normal or it could also mean you have an individual specimen that does not play nice with NiMH. Many of the Duracell NiMHs absolutely suck (although some are quite great), so you need to do a few runs with the eneloops before making the final determination here, IMO (those Sanyo/Pano cells are the benchmark of NiMH in the same way the MBP is the benchmark of laptops.) You may see better performance after several deep discharge/recharge cycles (and many good chargers can do this for you with a NiMH break-in feature.)

    Presumably due to the lower voltage, NiMH cells do not always play nice with some of the Magic Mouse models in some instances. I have one where I get a low battery warning after just a few weeks of using eneloop reality, well over 95% capacity remains, but the mouse seems to get confused by the lower voltage, makes an incorrect estimate, and the UI throws those annoying messages that Apple does not give us the option to disable. I have another Magic Mouse that can run for 3-4 months easily with the same eneloop Pros (it may even run to 6-8 months sometimes as I lose track?) I've always theorized this has to do with the firmware revisions where Apple tried to correct their error with some success.

    BUT...even on the Magic Mouse that will easily run 3-4 months, OS X's battery indicator will fall to around 50% within just several days to a week of use. Then, it will hold at that level for an extended period. So even though you are already down to 47%, the actual capacity remaining in the battery could very well exceed 90%, and this is just a voltage-related reading error.

    However, even with my Magic Mouse that can run for months on eneloop Pros, OS X' UI starts giving me that low battery warning when way more than 50% actual capacity remains, as verified with my Maha charger (which doesn't lie), and is still capable of delivering the voltage needed to run most other devices for a very long time. Most other devices I own are capable of running eneloop Pros much lower, including many higher discharge devices that place greater load on the batteries but do a good job of continuing to operate correctly even as the voltage decreases.

    Apple dropped the ball here IMO from both a functional and environmental perspective by failing to design a device and/or device firmware that can fully utilize ULSD NiMH. They did the same with the earlier generation of the wireless keyboards that used two AAs. Eneloops last significantly longer than alkaline batteries in many devices (especially high-drain ones), and, when a device has issues with a high-end ULSD NiMH as such, IMO that is a design failure on behalf of the device Maker. Most devices made in the past several decades don't have this sort of issue. :(
  5. TonyK macrumors 65816


    May 24, 2009
    We had 2 of the original Magic Mice here. Quit using both of them because of battery issues and even gave one away.
  6. Amigaman macrumors regular


    Sep 29, 2007
    Greenville, MI
    I use rechargeable batteries with my Magic Mouse and I end up having to swap in a fresh pair every two-three weeks. I pretty much use it every day, all day.

Share This Page

5 May 7, 2017