Looking for F2400 owners

Your onboard battery.
On your car’s display.

A clearer view of your FOSSiBOT F2400, on your phone and Android Auto. Battery level, power use and remaining time, connected directly over Bluetooth.

Help test the app Take a closer look

No app account. No Wi-Fi or MQTT required.
No ads, analytics or subscriptions.

Built by an F2400 owner. Now looking for other owners to test real batteries, phones and car displays.

The phone dashboard: a battery gauge, charging time, total input and output, and a schematic connecting AC, DC, USB and Lamp controls.
Actual app screen · example readings
FOSSiBOT F2400 Companion project artwork featuring the physical power station on a dark background with teal circuit traces.
01

See what’s happening

Charge level, estimated time and power in and out, with a live power-flow schematic.

02

Keep it within reach

Monitor your onboard battery through Android Auto, with simple output controls.

03

Make it work for you

Switch outputs, choose a Lamp mode and adjust supported charging limits and standby timers on your phone.

Made for Android Auto

Your battery.
On the car screen.

Battery level, remaining time and power totals, with AC, DC, USB and Lamp controls in one view.

Android Auto Car display
Android Auto showing 62 percent battery, discharging with 0 watts input and 1 watt output. Updated battery and status icons, power totals and all four output controls fit on one screen.
Actual Android Auto app running from a Pixel through Google’s Desktop Head Unit · live readings captured in version 1.0.8. Layouts adapt to the available car display. View full size.

Keep an eye on your onboard power. Connect the battery on your phone, then see its readings on your compatible Android Auto display.

The battery stays within Bluetooth range of your phone. Real-car testing is part of the beta; set up and test controls while parked.

One battery. A clearer picture.

The detail you need.
At a glance.

Use portrait or landscape on your phone. Choose Dark, OLED or Light to suit the way you use it.

Phone Landscape view
Landscape phone dashboard with a central battery gauge, input readings on the left and AC, DC, USB and Lamp controls on the right.
Phone landscape view. Screenshots use example readings; they are not live data from your battery.

On your phone, adjust supported charging settings and standby timers, choose a Lamp mode, and check fault diagnostics.

Made for tablets too

More screen.
Same simple control.

A layout designed for the extra space, with a large central battery gauge and input and output controls on either side.

Tablet 10-inch · Landscape view
Landscape tablet dashboard showing a large central battery gauge at 62.4 percent, charging time, power totals and inputs on the left, and AC, DC, USB and Lamp controls on the right.
10-inch tablet landscape view · example readings. View full size.

A small group. Useful feedback.

Have an F2400?
Let’s put it to the test.

You don’t need to be a developer. You do need a compatible battery and a little time to use the app and tell me how it goes.

What is the F2400?
A portable power station with a 2,048 Wh battery and up to 2,400 W AC output, for running appliances and charging devices away from mains power.

View the F2400 on FOSSiBOT’s official UK website

  1. Your battery

    A Bluetooth-enabled FOSSiBOT F2400. Development has been tested with an F2400-B; other hardware versions may differ. Please include your exact model when you email.

  2. Your Android phone

    Android 12 or newer, Bluetooth and a Google Play account. A compatible Android Auto car or head unit is a welcome extra, rather than a requirement for phone testing.

  3. Your experience

    Try the readings, output controls, settings and reconnection in everyday use. If possible, stay enrolled for at least 14 days and send back what works and what needs attention.

Volunteer for the closed test

Your battery.
Your feedback.
A better companion.

Email Steve to request a place. Include the Google email address you use in the Play Store, your battery model and your phone’s Android version. The button below opens a draft with those prompts.

Before you join

A few useful details.

Does it replace BrightEMS?

This is an independent alternative for Bluetooth monitoring and supported controls. It does not install battery firmware. Close BrightEMS while using the companion so the apps do not compete for the same Bluetooth connection.

Does it need an account or Wi-Fi?

The companion app connects directly over Bluetooth and does not need an app account, Wi-Fi, MQTT or Home Assistant. You need a Google account to join the test and install updates through Google Play.

Will every F2400 work?

Compatibility depends on the battery’s Bluetooth hardware and firmware. It has been developed with an F2400-B. Please send your exact model rather than assuming every generation supports the same protocol.

How should I interpret the readings?

Readings and remaining time come from the power station’s protocol. Per-output wattages are reconciled estimates of the reported total, with Lamp estimated at 1 W. Only battery and DC/PV fault groups are decoded.

Is this an official FOSSiBOT app?

No. FOSSiBOT F2400 Companion is independently developed by Steve Madden. It is not affiliated with or endorsed by FOSSiBOT or Google. Product names identify compatibility and belong to their respective owners.