# PhoneBattery vs Battery Master 12V

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.

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.

## The numbers

| Metric | PhoneBattery | Battery Master 12V |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (381 ratings)](https://appshunter.io/ios/app/phonebattery/id1009278300/reviews)** | [3.4 (5 ratings)](https://appshunter.io/ios/app/battery-master-12v/id1480710112/reviews) |
| Number of ratings | **381** | 5 |
| Positive reviews | **58.4% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 6 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 19 MB | 39 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Marcel Voss](https://appshunter.io/developer/707185887) | [Shenzhen Leagend Optoelectronics Co., Ltd.](https://appshunter.io/developer/6798210621) |

## What reviewers say

### PhoneBattery

[App page](https://appshunter.io/ios/app/phonebattery/id1009278300)

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.

**Highlights:** iPhone battery level on Apple Watch, Smart battery notifications, Apple Watch complications, Alternative app icons, Clean and simple interface

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small tip | $0.99 | one-time |
| Medium tip | $1.99 | one-time |
| Large tip | $3.99 | one-time |
| Generous tip | $4.99 | one-time |

**What reviewers like**

- 👍 Simple and intuitive user interface
- ⚡ Quick access to iPhone battery status from Apple Watch
- 🎯 Does exactly what it advertises
- 💰 Free app with no in-app purchases
- 🎨 Pleasant and elegant design

**What reviewers complain about**

- 🐛 App frequently stops working or becomes non-functional
- 🐛 Complication feature doesn't load data properly
- 🐛 Battery percentage displays incorrectly or shows blank screens
- ⚠️ Lacks compatibility with newer iOS and watchOS versions
- ⚠️ Poor customer support and slow response times

**Reported bugs**

- 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+

**Requested features**

- 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


### Battery Master 12V

[App page](https://appshunter.io/ios/app/battery-master-12v/id1480710112)

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.

**Highlights:** Lead-acid battery detection, Test battery CCA and health, Calculate available use life, Test cranking system, Test charging system, Share and print test results

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PhoneBattery free?

PhoneBattery is free to download, with in-app purchases available.

### Is Battery Master 12V free?

Battery Master 12V is free to download, with no in-app purchases.

### Which has better reviews, PhoneBattery or Battery Master 12V?

PhoneBattery is rated higher. PhoneBattery averages 4.3 out of 5 from 381 ratings, while Battery Master 12V averages 3.4 from 5 ratings.

### Do PhoneBattery or Battery Master 12V have ads?

Neither PhoneBattery nor Battery Master 12V shows ads.

### Which is updated more often, PhoneBattery or Battery Master 12V?

PhoneBattery ships an update every 8 days, and Battery Master 12V every 6 weeks. Most recently, PhoneBattery was updated on October 24, 2026 and Battery Master 12V on October 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*