Battery Watcher vs Smart Battery 24V
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!
Smart Battery 24V
Monitor the voltage of up to four 6V, 12V, or 24V batteries simultaneously. Test startup and charging systems, and accurately record vehicle start and stop times. View all data on your phone via Bluetooth for easy vehicle battery management.
- Monitor 6V, 12V, 24V batteries
- Simultaneous monitoring of four batteries
- Test startup and charging system voltage
- Record vehicle start/stop times
- Bluetooth data display
- Vehicle battery power management
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Smart Battery is an application for monitoring 6V, 12V, and 24V batteries. It can simultaneously monitor the voltage of four batteries. It helps users fully understand the battery by testing the startup and charging system voltage. It can accurately record the time when a car starts and stops. All data can be displayed on the phone through Bluetooth. Easy to manage vehicle battery power
Screenshots
Verdict
The clearest difference is review sentiment: Battery Watcher at 71% against Smart Battery 24V's 0%. Battery Watcher also leads on rating (4.5 vs 2.0) and ratings volume (338 vs 1). Smart Battery 24V's advantage is in-app purchases (none vs 1) and iOS requirement (15.6 vs 18.6). 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. Smart Battery 24V asks for nothing beyond the download.
Battery Watcher holds the better App Store score, 4.5 against 2.0. That said, the two scores are not equally well evidenced: Battery Watcher has 338 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 71% of Battery Watcher's written reviews are positive against 0% of Smart Battery 24V's.
Battery Watcher ships an update fortnightly, Smart Battery 24V every 5 weeks. The most recent releases landed on October 16, 2026 and September 27, 2026 respectively.
| Parameter | Battery Watcher | Smart Battery 24V |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (338 ratings) — better | 2.0 (1 ratings) |
| Positive reviews | 70.7% of reviews — better | 0.0% of reviews |
| Number of ratings | 338 — better | 1 |
| Update frequency | Fortnightly — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, Apple Watch | iPhone, iPod, Apple Watch — better |
| Requires iOS | 18.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 2 MB | 68 MB |
| Age rating | 4+ | 4+ |
| Developer | Slackerz Inc | Shenzhen Leagend Optoelectronics Co., Ltd. |
Customer experience
Battery Watcher
Smart Battery 24V
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
Smart Battery 24V
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Battery Watcher
- Battery Watcher Premium$1.99
Smart Battery 24V
No in-app purchases
Questions
Is Battery Watcher free?
Is Smart Battery 24V free?
Which has better reviews, Battery Watcher or Smart Battery 24V?
Do Battery Watcher or Smart Battery 24V have ads?
Which is updated more often, Battery Watcher or Smart Battery 24V?
Other comparisons
