I need to send my MX Keys to the service. It is under warranty but I am constantly delaying to stay without it. The reason is a well-documented bug with backlighting blinking even when the computer is turned off. So I don't know how long the battery lasts.
I have k800i in backup (my old keyboard), and the battery was ok, nothing extraordinary but definitely not bad.
I am also using K830i as a keyboard for Android TV and to control the computer remotely when using big TV as an extended desktop. It is hard to tell how long it lasted considering I am not using it much, but the last time I've recharged, it was 6 months ago or so. So overall, they are fine, I am using their products for years.
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