# NanoBattery — Watch Battery Monitor & Sync

> Watch Battery Monitor & Sync (iPhone/iPad app by Giovanni Outerleys.)

- Source: https://appshunter.io/ios/app/nanobattery/id6756941302 (this page in markdown: same URL + `.md`)
- Developer: [Giovanni Outerleys](https://appshunter.io/developer/1557846953)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.6 · 16 MB
- Languages: American English
- Released: 2026-01-29
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/nanobattery/id6756941302/reviews.md

## What is NanoBattery?

NanoBattery is the essential utility for your Apple Watch.

Stop guessing how much power is left on your wrist. NanoBattery seamlessly syncs your Apple Watch battery level to your iPhone, keeping you informed at a glance.

Designed with a sleek "Black & Yellow" aesthetic perfect for OLED screens, NanoBattery feels right at home on your modern iOS device.

KEY FEATURES:

• Instant Monitoring: Check your Watch battery level directly from the app dashboard.
• Smart Widgets: Add beautiful widgets to your Home Screen and Lock Screen to track power levels without unlocking your phone. 
• Dynamic Island & Live Activities: Keep an eye on your battery in real-time with support for the latest iOS features. 
• Custom Alerts: Receive a notification on your iPhone when your Watch battery drops below a specific threshold (e.g., 20%). 
• Battery-Friendly: Uses efficient background refresh technology to sync data without draining your device.

HOW IT WORKS: NanoBattery uses background app refresh to periodically fetch data from your Watch (typically every 15-20 minutes) or instantly when you open the app or tap the widget.

PRIVACY FIRST: No data collection, no tracking. Your battery data stays between your devices.

Download NanoBattery today and never let your Watch run out of power unexpectedly!


## Version history (last 1 release)

### 1.0 — 2026-01-29

No release notes.

## More apps by Giovanni Outerleys

- [Logic Party](https://appshunter.io/ios/app/logic-party/id1557846951)
- [Logik](https://appshunter.io/ios/app/logik/id1620693499)
- [NanoPDF](https://appshunter.io/ios/app/nanopdf/id6467386184)

All apps by Giovanni Outerleys: https://appshunter.io/developer/1557846953

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-19.*