PhoneBattery vs Battery Master 12V
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PhoneBattery
This app displays your iPhone's battery level directly on your Apple Watch. Avoid constantly checking your phone with quick glances at your wrist, perfect for workouts, commutes, or when your phone is just out of reach.
- iPhone battery level on Apple Watch
- Smart battery notifications
- Apple Watch complications
- Alternative app icons
- Clean and simple interface
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PhoneBattery is the tiny little app that solves a surprisingly annoying problem How much battery is left on your iPhone? And why do you need to dig it out of your pocket every time just to find out? With PhoneBattery, you can simply glance at your Apple Watch and boom — mystery solved. Perfect for: • Workouts where your phone is buried somewhere in a sweaty pocket • Busy commutes with too many bags and not enough hands • Couch-days where the phone is just a little too far away No magic. No fuss. Just your iPhone battery, right where it should be: on your wrist. FEATURES • Smart battery notifications (never get caught at 2 percent again) • Clean and simple interface (nothing extra, no clutter) • Lots of Apple Watch complications • Alternative app icons (because vibes matter) • Free, no ads, and made by one indie developer • Optional tips if you want to support future features Need help or want to say hi? help@marcelvoss.com
Battery Master 12V
This tool detects and tests lead-acid batteries, assessing CCA and health. It calculates remaining battery life based on temperature and CCA data. Users can also test cranking and charging systems, with all results shareable and printable.
- Lead-acid battery detection
- Test battery CCA and health
- Calculate available use life
- Test cranking system
- Test charging system
- Share and print test results
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Battery Master is the detection tool for lead acid battery. By installed on battery, it can intelligently test battery CCA and health condition, calculate battery available use life based on temperature and CCA data sheet. When phone is close to device, the app will automatically obtain battery test result. Also, user can alternatively test battery health, cranking system and charging system. All saved history test results can be shared and printed out.
Screenshots
Verdict
The clearest difference is review sentiment: PhoneBattery at 58% against Battery Master 12V's 0%. PhoneBattery also leads on rating (4.3 vs 3.4) and ratings volume (381 vs 5). Battery Master 12V's advantage is in-app purchases (none vs 4) and iOS requirement (15.6 vs 18.0). 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. PhoneBattery sells 4 one-off in-app purchases. Battery Master 12V asks for nothing beyond the download.
PhoneBattery holds the better App Store score, 4.3 against 3.4. That said, the two scores are not equally well evidenced: PhoneBattery has 381 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 58% of PhoneBattery's written reviews are positive against 0% of Battery Master 12V's.
PhoneBattery ships an update every 8 days, Battery Master 12V every 6 weeks. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.
| Parameter | PhoneBattery | Battery Master 12V |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (381 ratings) — better | 3.4 (5 ratings) |
| Positive reviews | 58.4% of reviews — better | 0.0% of reviews |
| Number of ratings | 381 — better | 5 |
| Update frequency | Every 8 days — better | Every 6 weeks |
| 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 | 18.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 19 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | Marcel Voss | Shenzhen Leagend Optoelectronics Co., Ltd. |
Customer experience
PhoneBattery
Battery Master 12V
Bugs and requests
PhoneBattery
Reported bugs
10 issues- Complication shows skeleton loading screen but never loads data
- App displays blank battery icon with no charge information
- Battery percentage shows incorrect values
- App only works if opened on phone first
- Incompatible with watchOS 7 and iOS 14+
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- Circular display setting doesn't apply
- Low battery notifications never trigger
- App crashes or fails to display on Apple Watch
- Settings changes don't persist (e.g., round to long battery display)
- Inconsistent functionality across Watch Series 3, 5, 6 models
Requested features
8 requests- Add working complication for watch face integration
- Support for circular battery indicator display
- Sound notifications for low battery alerts
- Display phone signal strength information
- Show Bluetooth headphone battery percentage
Show 3 moreShow fewer
- Change Apple Watch app icon customization
- Battery health information display
- Regular app updates for current OS compatibility
Battery Master 12V
Not enough reviews yet to summarise bugs or requests.
In-app purchases
PhoneBattery
- Small tip$0.99
- Medium tip$1.99
- Large tip$3.99
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- Generous tip$4.99
Battery Master 12V
No in-app purchases
Questions
Is PhoneBattery free?
Is Battery Master 12V free?
Which has better reviews, PhoneBattery or Battery Master 12V?
Do PhoneBattery or Battery Master 12V have ads?
Which is updated more often, PhoneBattery or Battery Master 12V?
Other comparisons
