Hello,
we just figure out how to re-enable a Smart Battery BLE (Bluetooth Low Energy) module.
Ref. to the Firmware Changelog …
v1.20-- 06 November 2020
- Added ability to re-enable BLE again after it was disabled by the user.
To re-enable BLE, a specific pin of the BLE module has to be connected to the module shield for 5 seconds.
Note that the cover of the battery has to be opened to re-enable BLE. This can damage the battery housing. See the manual for more detailed information.
Ref. to the manual …
https://www.victronenergy.com/upload/documents/Lithium_Battery_Smart/15958-Manual_Lithium_Smart_Battery-pdf-en.pdf
(rev 21 - 01/2026) page 32
- “6.3.1. Cannot connect with VictronConnect to the battery
6. Has Bluetooth been disabled in the battery product settings?
IMPORTANT: Disabling Bluetooth is an irreversible process. Once Bluetooth has been disabled, it can never be re-enabled.”
Manual is wrong at this point!
Firmware changelog is right.
After we remove the top cover, we see the BLE Chipset “MDBT42Q – 512KV2 (Chip Antenna)” and download the datasheet from https://www.raytac.com/ .
With a litte bit reverse engineering we figure out that there are two pins with no connections on the pcb (printed circuit board) and +3.3V.
P0.25 (2)
P0.26 (3)
The shield has GND level.
We still connect P0.25 (2) for five seconds to shield.
And voila, BLE Battery appears immediately in the VictronConnectApp. 
BLE was switched of since Feb. 2022 for IT security reasons.
Still upgrade firmware from v1.25 to v1.31.
Maybe we will install a little reset button for next BLE re-enable.
Links to old forum (community archive) entries with the same question …