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Apple has replaced my Magic Mouse 1 three times due to issues with the mouse (inappropriate scrolling and eating battery life). I wasn't surprised to learn that although the user had reported their issue to Apple Support at least three different times, Apple Support claimed they had no reports of this issue. Although their conversation is from 2009, they did have some useful to me suggestions. If you enter those words without the quotes in a search (this area appears at the top of this page to the right of the words Apple Support Communities), you should be able to read how those Apple users solved their battery problems. Did you read the conversation "Re: Apple Wireless Keyboard Eating Batteries"? This conversation shows up on the page below this discussion. I had the issue with my mouse eating batteries.
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I'm confident Apple will figure out why El Capitan is draining our batteries and fix the problem. I have Apple wireless keyboard purchased 9.9.15 and I have only had to replace my Duracell non-rechargeable batteries once, but the mouse and the keypad are a different story. While Apple is figuring this out, you will waste too much money with non-rechargeable batteries. I like the added security of El Capitan, but it has created issues with my Magic Mouse battery life and my mouse's sensitivity that didn't occur under Yosemite. I have had to replace brand new out of the package Duracell non-rechargeable batteries every day since purchase on March 9, 2016. My KeyPad although purchased from Apple, isn't theirs.
Magic battery 10 in 1 Bluetooth#
You will spend more than $40 a month for non-rechargeable batteries in your Bluetooth keyboard and mouse and KeyPad. I would stick with your rechargeable batteries. I didn't have this problem with Yosemite either. Since upgrading to El Capitan 10.11.4 on MaI too have had difficulties with the battery life of Duracell brand new non-rechargeable batteries. I don't know why Barry Hemphill-level 8 would say to use non-rechargeable batteries.