# Battery Master 12V vs Battery Asst

The clearest difference is rating: Battery Asst at 4.0 against Battery Master 12V's 3.4. Battery Asst also leads on review sentiment (20% vs 0%) and iOS requirement (9.0 vs 15.6). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Battery Asst holds the better App Store score, 4.0 against 3.4. Both are backed by a comparable volume of ratings — 5 and 8 respectively. Written reviews point the same way: 0% of Battery Master 12V's written reviews are positive against 20% of Battery Asst's.

Battery Master 12V ships an update every 6 weeks, Battery Asst monthly. Both last shipped on November 3, 2026.

## The numbers

| Metric | Battery Master 12V | Battery Asst |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (5 ratings)](https://appshunter.io/ios/app/battery-master-12v/id1480710112/reviews) | **[4.0 (8 ratings)](https://appshunter.io/ios/app/battery-asst/id1601588941/reviews)** |
| Number of ratings | 5 | **8** |
| Positive reviews | 0.0% of reviews | **20.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Monetization | Free | Free |
| Size | 39 MB | 23 MB |
| Requires iOS | 15.6 | **9.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Leagend Optoelectronics Co., Ltd.](https://appshunter.io/developer/6798210621) | [婷 赵](https://appshunter.io/developer/1455495649) |

## What reviewers say

### 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


### Battery Asst

[App page](https://appshunter.io/ios/app/battery-asst/id1601588941)

Monitor your car battery's voltage in real time. This practical app displays the starting and charging system voltages, providing a comprehensive understanding of your car battery's condition directly on your mobile device via Bluetooth.

**Highlights:** Real-time car battery voltage display, Monitor starting system voltage, Monitor charging system voltage, Bluetooth data transmission, All-round battery condition understanding

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Battery Master 12V free?

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

### Is Battery Asst free?

Battery Asst is free to download, with no in-app purchases.

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

Battery Asst is rated higher. Battery Master 12V averages 3.4 out of 5 from 5 ratings, while Battery Asst averages 4.0 from 8 ratings.

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

Neither Battery Master 12V nor Battery Asst shows ads.

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

Battery Master 12V ships an update every 6 weeks, and Battery Asst monthly. Most recently, Battery Master 12V was updated on November 3, 2026 and Battery Asst on November 3, 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.*