# Badger 2040W + Custom U2F + Bluetooth + Battery Issues

**URL:** https://forums.pimoroni.com/t/badger-2040w-custom-u2f-bluetooth-battery-issues/21952
**Category:** Support
**Created:** [April 13, 2023, 12:27pm UTC](https://forums.pimoroni.com/t/badger-2040w-custom-u2f-bluetooth-battery-issues/21952 "2023-04-13T12:27:10Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![netshade](https://avatars.discourse-cdn.com/v4/letter/n/f05b48/32.png) [@netshade](https://forums.pimoroni.com/u/netshade)
#### Post date: [April 13, 2023, 12:27pm UTC](https://forums.pimoroni.com/t/badger-2040w-custom-u2f-bluetooth-battery-issues/21952/1 "2023-04-13T12:27:10Z")

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I’ve recently got a Badger 2040W, and wrote a small C++ program that spins up the Bluetooth LE radio and draws images to the screen. On USB, this works perfectly fine. However, when I connect the battery power that comes w/ the Badger 2040W accessory kit, the application fails to start. I’ve seen some discussion about how to “restart” the chip by holding reset and a front button, but I’ve kinda assumed that is a thing programmed into the MicroPython / “Badger OS” U2F that is no loner present, as I’ve replaced it with my own program.

Is there a trick or special behavior I need to add to my C++ code to get the application to start on battery? Or some other consideration I should have? ( Note: I’ve tested my batteries, they do have power. )