Every time Apple or Google introduces a new smartwatch, I'm always hopeful that it will have 5+ days of battery life. Since they never do, I assumed that it's basically just not possible (without sacrificing size, a la Garmin).
But when I looked into replacements for my aging Pebble, I found out that various Chinese companies offer smartwatches that have great screens, svelte profiles, and much better battery life. Huawei, Xiaomi, and Amazfit all have watches that seem to have far superior battery life than Apple/Google. Why is this?
For example, I'm currently trying the Amazfit GTR 4, which is providing 8-9 days of battery life in real-world usage. The watch isn't bulky and the screen seems as good as any Apple/Google watch I've seen.
I know Apple and Google watches offer more functionality, but this doesn't explain why the devices would chew through 2x-3x as much battery as an Amazfit when in standby mode.