Battery Watcher vs Ultimus Battery
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Battery Watcher
Monitor your iPhone's battery status directly from your Apple Watch. View current levels, historical data, and receive alerts for a full charge. Perfect for quick checks without needing your phone.
- iPhone battery status on Apple Watch
- Watch face complications
- 24-hour battery history
- Visual charge history graph
- Full charge alerts
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Battery Watcher gives you the status of your iPhone battery right on your Apple Watch! Battery Watcher now supports watchOS 5 and Apple Watch Series 4!! Battery Watcher now leverages the new Apple Watch background processing to keep your Apple Watch up to date with the latest battery level of your iPhone. New Features: - Complications: Check the status of your iPhone battery right from your watch face! - Time Travel: Now you can look back and see what the power level of your iPhone was in the last 24 hours - Battery Level Premium: Upgrade to Battery Level Premium and get the charge history of iPhone battery right on your watch in an easy to use visual graph. Use the Digital Crown to view all the iPhone battery level history for the past 24 and 72 hours! - Full Charge Alert: If you purchase Battery Level Premium, you can receive an alert when your iPhone reaches full charge! For those that want to know how much battery life your iPhone has left without pulling it out of your pocket, this app is for you!
Ultimus Battery
Monitor your battery's health and performance wirelessly from your iOS device. Track cycle life, state of charge, voltage, current, and temperature with easy-to-read gauges and text alerts. Connect to individual batteries or battery banks up to 15 feet away.
- Wireless battery monitoring
- Track cycle life
- State of Charge (SOC) percentage
- Display voltage, current, temperature
- Battery event alerts
- Bluetooth BLE 4.0+ connectivity
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"FEATURES * No need for a separate battery monitor⋯save hundreds of dollars! * Wirelessly connect to each battery or your battery bank from your IOS device. * Access each BMS independently or the battery bank as a group. * Track Cycle Life on each battery. * Displays State Of Charge (SOC) percentage with a graphic display. * Display voltage, charging or discharging current, and temperature. * Easy to read gauges. * Battery Events displayed in easy to understand text. * Works up to 15 feet from the battery. * Displays each battery signal level. * Uses Bluetooth BLE 4.0 or later * Compatible with iPhones with IOS 7.0 or later"
Screenshots
Verdict
The clearest difference is in-app purchases: Ultimus Battery at none against Battery Watcher's 1. Ultimus Battery also leads on rating (5.0 vs 4.5) and iOS requirement (13.0 vs 18.6). Battery Watcher's advantage is update cadence (fortnightly vs every 12 months) and ratings volume (340 vs 2). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Battery Watcher sells 1 one-off in-app purchase. Ultimus Battery asks for nothing beyond the download.
Ultimus Battery holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Battery Watcher has 340 ratings behind it against 2, so its average is the more settled of the two.
Battery Watcher ships an update fortnightly, Ultimus Battery every 12 months. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.
| Parameter | Battery Watcher | Ultimus Battery |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (340 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 70.7% of reviews | — |
| Number of ratings | 340 — better | 2 |
| Update frequency | Fortnightly — better | Every 12 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Requires iOS | 18.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Slackerz Inc | Larry Crutcher |
Customer experience
Battery Watcher
Ultimus Battery
Bugs and requests
Battery Watcher
Reported bugs
9 issues- App fails to communicate with iPhone from Watch
- Battery graphic jumps out of place on iPhone app
- Complication doesn't update without opening app
- Inaccurate battery percentage readings
- App disconnects from Watch frequently
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- Premium full-charge notification doesn't work
- App crashes or becomes unresponsive after updates
- White battery icon stuck in corner with display glitches
- Crown interaction doesn't affect graphing as advertised
Requested features
8 requests- Low battery mode functionality
- Battery percentage viewing on iPhone (currently watch-only)
- Custom notification alerts at user-defined battery percentages
- User-configurable logging intervals for battery tracking
- Settings menu to customize watch display and disable text clutter
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- Complication support for watch face
- Glance feature for quick access
- Better customization options for watch app display
Ultimus Battery
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Battery Watcher
- Battery Watcher Premium$1.99
Ultimus Battery
No in-app purchases
Questions
Is Battery Watcher free?
Is Ultimus Battery free?
Which has better reviews, Battery Watcher or Ultimus Battery?
Do Battery Watcher or Ultimus Battery have ads?
Which is updated more often, Battery Watcher or Ultimus Battery?
Other comparisons
