I've never had any battery drain issue with my ClaraHD which I use with a 3rd-party sleepcover. Everything works well with firmware 4.15.12920. I never use wi-fi.
Perhaps the problems you're having are related to:
- a fault with your particular sleepcover
- a problem with firmware 4.16.13162
- a problem with wi-fi, e.g. device constantly re-trying to connect
- storing your ClaraHD in the vicinity of a second magnetic source
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