Q: Wireless Keyboard 1-2 day battery life!

Try non-rechargeable batteries....

Battery life is a function of usage. I do not know of anything the software update would have done to cause the problem.

Barry

I don't know why Barry Hemphill-level 8 would say to use non-rechargeable batteries. Since upgrading to El Capitan 10.11.4 on March 9, 2016 I too have had difficulties with the battery life of Duracell brand new non-rechargeable batteries. I didn't have this problem with Yosemite either. I would stick with your rechargeable batteries. You will spend more than $40 a month for non-rechargeable batteries in your Bluetooth keyboard and mouse and KeyPad. My mouse and keyboard are Apple's. My KeyPad although purchased from Apple, isn't theirs. I have had to replace brand new out of the package Duracell non-rechargeable batteries every day since purchase on March 9, 2016. 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. While Apple is figuring this out, you will waste too much money with non-rechargeable batteries. 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. I'm confident Apple will figure out why El Capitan is draining our batteries and fix the problem. It is a software issue!

Do you understand the meaning of the word, try?

Barry

1. Be polite. Everyone should feel comfortable reading Submissions and participating in discussions. Apple will not tolerate flames or other inappropriate statements, material, or links. Most often, a "flame" is simply a statement that is taunting and thus arbitrarily inflammatory. However, this also includes those which are libelous, defamatory, indecent, harmful, harassing, intimidating, threatening, hateful, objectionable, discriminatory, abusive, vulgar, obscene, pornographic, sexually explicit, or offensive in a sexual, racial, cultural, or ethnic context.

I have exactly the same problem with my keyboard since upgrading to OS X El Capitan (10.11.4) on 14 April! My mouse is unaffected.

I have tried Duracell ultra power alkaline and rechargeable batteries - with no improvement on 8 hours - despite shutting down all notifications etc that could cause battery drain! This is getting ridiculous - have you managed to resolve your issue?

thanks for any advice

I had the issue with my mouse eating batteries.  Did you read the conversation "Re: Apple Wireless Keyboard Eating Batteries"?  This conversation shows up on the page below this discussion.  I have typed the words exactly for you.  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.  Although their conversation is from 2009, they did have some useful to me suggestions.  Best of luck.  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.  I have experienced the same situation.  Apple has replaced my Magic Mouse 1 three times due to issues with the mouse (inappropriate scrolling and eating battery life).  This final mouse finally behaves appropriately.  Best of luck.  Stick with your rechargeable batteries.  I wasted bunches of money on non-rechargeable batteries while Apple solved my problem with my keypad and Magic Mouse 1. 

Thanks so much!

Will check out that conversation now, fingers crossed..

Good Luck.