I love my MX keys keyboard(s). I have two of them because when I originally complained about how often (every 3-4 days) it has to be charged, you just sent me another one. Thank you for that. I'm writing because I believe the cause of the battery drain is the sensitivity of whatever sensors trigger the keyboard backlight. However, I can be sitting across the room, while the computer is asleep; and watch the keyboard frequently turn on the backlight when there's no movement anywhere near it. Seems like a software tweak of the sensitivity of whatever motion sensor you have would help greatly. Now, I just shut the keyboard off when I'm away from the computer. That seems to buy me a couple of extra days of usage before having to charge it.