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An iPhone battery and charging monitor built on Apple's private APIs. It reads the phone's own power-management sensors — the ones iOS uses to run the charge — and shows what the charger is delivering, how much of it reaches the cell, where the rest goes as heat, and what every temperature sensor in the phone is doing while it happens.
| Power | Thermal | Adapter | History |
|---|---|---|---|
 |
 |
 |
 |
Sideload only. Private APIs mean this can never be on the App Store — you sign and install it yourself. There is no network code of any kind: nothing it reads leaves your phone.
Download the latest MiniWatts-unsigned.ipa from
Releases and sign it with your own
Apple ID — Sideloadly, AltStore,
SideStore and Xcode all do this. A free Apple ID works; the app
then expires after seven days and you re-sign it.
Requires iPhone, iOS 17 or later.
Only what iOS actually hands a sandboxed app. Battery health and cycle count are
filtered out of the registry; accessory batteries (Watch, AirPods) come back empty;
wireless charging exposes no input current, so on MagSafe you only see what reaches the
cell; discharge power has no sensor and is estimated from the percentage. Charging holds
can only be inferred, and the app labels them inferred when that is what happened.
Xcode 26 or later, iOS 17 deployment target, no dependencies.
./scripts/build-ipa.sh # unsigned, what Releases ships
TEAM_ID=ABCDE12345 ./scripts/build-ipa.sh signed # signed, for your own deviceCLAUDE.md is the engineering notebook: which APIs the sandbox blocks and
how that was established, what each sensor turned out to be, and the Swift 6 isolation
traps this project has already fallen into.
Apache 2.0 — see LICENSE. The method for reading the PMU is derived from
ios-charging-monitor (MIT);
BatteryCenterBridge owes two details to Batsie.
Both are credited in NOTICE, which carries the upstream MIT notice.
Private APIs can change or disappear in any iOS update.