USB Charger for Hilti 22V battery.
I use this device with a fully charged hilti battery to prevent undercharging and destroying the battery.
use at your own risk
Used parts:
https://www.amazon.de/-/en/HELLA-8KW-054-944-003-Connector/dp/B003NDT016 connector 2 pieces
https://www.aliexpress.com/item/1005004066330145.html usb charger
2mm screw 4 pieces