# Battery ETA: Home Backup — Time left: Marstek Venus E 3.0

> Time left: Marstek Venus E 3.0 (iPhone/iPad app by Nikita Lapin.)

- Source: https://appshunter.io/ios/app/battery-eta-home-backup/id6822926943 (this page in markdown: same URL + `.md`)
- Developer: [Nikita Lapin](https://appshunter.io/developer/1534535133)
- Category: Utilities, Lifestyle
- Price: $2.99
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English, Ukrainian
- Released: 2026-10-30
- Data updated: 2026-11-06

## What is Battery ETA?

Find out if your Marstek battery will last until the end of the outage.

BEFORE YOU BUY
• We support only Marstek Venus E 3.0 with firmware V150 or newer, on iPhone or iPad.
• You must be on the same Wi‑Fi as the battery for the app to work correctly.
All limits: https://lapin7771n.github.io/marstek_analytics/support/#limits

Battery ETA reads your Marstek Venus E 3.0 over your home Wi‑Fi and turns the numbers into one answer: the time left at the current load. While the battery charges, it shows the time until full.

TIME LEFT
• EMPTY IN: time until the battery reaches your reserve
• FULL IN: time until it is fully charged
• IF OUTAGE: how long the battery would last if the grid went down now
• Charge in percent and power in watts

POWER BACK AT
• Add your Kyiv address and get a plain answer from the YASNO schedule: "Lasts until 18:00, 1 h 20 min to spare" or "Runs out at 16:40, 40 min short"
• If it falls short, the app tells you how many watts to cut

WIDGETS
• Home Screen: charge ring, or charge with time left
• Lock Screen: round gauge or a line with time left
• See the numbers during an outage without opening the app

DURING AN OUTAGE
• Live Activity: the charge and the run-out time on the Lock Screen and in the Dynamic Island

TODAY AND WEEK
• A chart of today's charge and hourly power
• Energy charged and used, and time on battery
• The same totals over the last 7 days

ALERTS
• A warning 30 minutes before a scheduled YASNO outage if the battery won't last (addresses in Kyiv)
• A notification when less than 30 minutes are left, and when the battery reaches the reserve

SET UP IN A MINUTE
• Turn on Local API in the Marstek app
• Tap Find battery, and the app finds it on your Wi‑Fi
• No account and no sign-in

PRIVACY
Battery ETA only reads the battery status and never changes a battery setting. Readings stay on your device. No ads, no analytics, no tracking.

Battery ETA is an independent app. It is not made by, endorsed by or affiliated with Marstek.

## Is Battery ETA safe?

Not enough ratings yet to assess Battery ETA.

## Is Battery ETA legit?

Battery ETA: Home Backup has limited verification signals. The AppsHunter Legitimacy Score for Battery ETA is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 1.3 — 2026-11-03

• A warning on the home and Lock Screen when the schedule says power is due but the battery is still discharging
• Live Activity shows the charge, the power and the time the battery runs out
• The forecast before an outage counts from the outage start
• The grid return time comes only from the YASNO schedule (addresses in Kyiv) and can't be set by hand
• Fixed false power readings while charging

### 1.2 — 2026-10-31

• New home screen: charge and time left at a glance, settings moved to their own screen
• Week: energy charged and used over 7 days
• A warning 30 minutes before a scheduled YASNO outage if the battery won't last (addresses in Kyiv)
• Live Activity during an outage: a countdown on the Lock Screen and in the Dynamic Island

### 1.1 — 2026-10-30

No release notes.

## More apps by Nikita Lapin

- [Golden Delta](https://appshunter.io/ios/app/golden-delta/id6819241927)

All apps by Nikita Lapin: https://appshunter.io/developer/1534535133

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-06.*