[serf]

36ish hours a charge w/ HR stuff enabled.

[hobo_mark]

Yet, my 10+ years old pebble 2 HR lasts a week, and the new pebble time 2 claims up to a month.

[swiftcoder]

Yeah, 36 hours is honestly pretty disappointing. The old Withings ScanWatch easily ran >2 weeks with HR and notifications enabled, I'd have expected similar performance from the Casio.