Lab Conditions vs. Real-World Use
Best-case battery life figures often assume minimal sensor polling and no display use; real-world figures with continuous heart rate tracking and regular app sync typically run meaningfully lower.
What a Credible Test Protocol Looks Like
Manufacturers should test battery life under a defined, disclosed usage profile (e.g. continuous heart rate tracking, hourly sync) rather than reporting only the theoretical maximum.
What to Ask Before You Market a Battery Life Number
Request your manufacturer’s actual test methodology before printing a battery life claim on packaging — a number that doesn’t hold up in customer reviews creates a returns and reputation problem that’s expensive to fix after launch.