Is your Xiaomi watch battery normal?
Xiaomi publishes no capacity figure and no fault threshold, but it does something no other brand here does: it puts a percentage on what individual features cost per day. Always-on display 15–20%, high-precision sleep monitoring 13–18%. On a Xiaomi, the answer is usually arithmetic rather than a failing cell.
What Xiaomi will actually tell you
On ageing: Xiaomi publishes no capacity-retention figure or cycle count. Its own guidance is that when you notice a significant drop in battery life compared with normal use, the battery should be replaced to keep the watch usable — a judgement call rather than a threshold.
Reading battery health yourself: Xiaomi exposes no capacity figure on the watch, so the 24-hour idle test is the closest thing to a measurement an owner can take.
Xiaomi's own battery FAQWhat to change on a Xiaomi, biggest saving first
Ordered by what it actually saves. Brand guidance usually is not — which is how “turn off music” ends up above “disable always-on” in a manual.
- Turn the always-on display offXiaomi is one of very few makers that puts a number on it: AOD is expected to cost 15–20% of the charge per day. On a watch rated for a fortnight, that one setting is most of the difference.
- Switch from Smart mode to Power SaverXiaomi ships two modes rather than a list of toggles. Smart mode gives you everything and spends accordingly; Power Saver limits or disables the expensive features for you.
- Turn off high-precision sleep monitoringXiaomi expects it to cost 13–18% of the charge per day — the only brand that quantifies what sleep tracking costs, and a surprise to most owners because it runs while they are asleep.
- Turn off all-day blood oxygen, heart rate and stress monitoring in Mi FitnessAll three sample continuously and all three are switched in the phone app rather than on the watch, which is why most owners never find them.
- Use automatic brightness, and check what is still running in the backgroundXiaomi names GPS, Bluetooth and music playback left running in the background as significant drains, alongside screen brightness.
- Keep the watch firmware and Mi Fitness up to dateXiaomi's own first-line advice, and reasonable: some updates exist specifically to improve battery management.
Storing, charging and replacing
Storing itnot published by the brand
Xiaomi publishes no storage charge range for its watches. General lithium-ion practice applies: part-charged rather than full or flat, and out of heat.
Charging it
Xiaomi watches charge on a magnetic pad. The watch warns at 15%, 10% and 5%, and the 10% and 5% prompts offer to switch on Power Saver from the notification itself — worth taking, because Power Saver on a Xiaomi is a different operating mode rather than a handful of toggles.
Replacing the battery
Not user-replaceable; service goes through Xiaomi. No standard price is published. Xiaomi’s own position is that when battery life has dropped noticeably against normal use, the battery should be replaced to keep the watch usable — which is advice rather than a threshold, and at Xiaomi’s price points a replacement can approach the cost of a newer model.
What the warranty covers
Xiaomi’s warranty covers manufacturing defects, and terms vary by region more than most because the same watch is sold under Xiaomi, Redmi and Mi branding in different markets. With no published capacity threshold there is no stated line to point at, so a measured idle-test result and the date a drain started are the useful things to bring.
Xiaomi battery questions
- How much battery does always-on display really use on a Xiaomi watch?
- Xiaomi expects it to cost 15–20% of the charge per day. That is the brand’s own figure, not an estimate — and on a watch rated for two weeks it is most of the gap between the advertised runtime and what owners actually see.
- Why does my Xiaomi watch drain overnight?
- High-precision sleep monitoring, most likely. Xiaomi expects it to use 13–18% of the charge per day, and it is the only brand here that quantifies what sleep tracking costs. It runs while you are asleep, which is why it is rarely the setting anybody suspects.
- What is the difference between Smart mode and Power Saver?
- Smart mode gives you every function and spends accordingly. Power Saver limits or disables the expensive features for you, and each mode has its own published runtime — so switching modes is a bigger, simpler lever than hunting individual toggles.
This is general information, not a diagnosis: it compares one figure you have given us against the runtime the manufacturer publishes, and we cannot measure your battery. Your manufacturer or an authorised service centre is the only place that can test it. Service pricing and warranty terms vary by country and change over time — treat the figures here as a starting point and confirm them with Xiaomi for your own model.