BH Ultralight Di2 Battery: Read Both Locations in the 2026 Manual
The BH Ultralight Di2 battery is documented in two mounting sections of the 2026 manual. One describes the bottom-bracket shell, while the other shows a seatpost mount. Both sections name LR906, LR806 and LR706. Their presence does not identify which arrangement is installed in an individual bicycle.
Read both BH Ultralight Di2 battery sections
Page 15 depicts the battery with a holder at the bottom-bracket shell. Page 16 depicts a battery and a 27.2 mm seatpost holder. Read these as two documented assemblies, rather than selecting one from a photograph of the outside of the bicycle.
The seatpost-holder reference is 387458500. That reference identifies the mounting component in the drawing; it is not a battery specification. Keep the holder, battery and electrical-system identity separate when asking a dealer which spare part or service is needed.
Establish what is actually installed
Give the workshop the model code, purchase information and any records of previous electronic-shifting work. A used bicycle may have received changes that its original sales description does not record. State whether the enquiry concerns a mounting part, a battery fault or routine service.
The manual’s two sections should not be turned into an instruction to move the battery from one location to the other. They do not, by themselves, establish that the electrical equipment, routing and mounting parts on a particular bicycle support a relocation.
Use the diagram to improve the service request
A useful request asks the workshop to identify the installed arrangement and required component before ordering. Include the symptoms and when they began. The location drawings can make that conversation clearer without requiring the owner to remove the seatpost or open the frame.
An electronic-shifting problem is not diagnosed by finding a plausible holder reference. Have the actual system assessed and follow its applicable service instructions. Retain the confirmed mounting and component details with the bicycle’s records so that a later enquiry begins from verified information.
FAQ
Do both mounting sections name the same three model codes?
Yes. The 2026 document names LR906, LR806 and LR706 in both sections.
What does 387458500 identify?
It is the Di2 seatpost-mount reference shown with a 27.2 mm holder.
Do the drawings prove which location my bicycle uses?
No. The actual bicycle and its service history still need to be checked.
Ask for the installed arrangement to be recorded after service. Other BH ownership references address separate parts questions, and the brand-family introduction provides wider background.
Primary references: BH manufacturer manual 1 (https://www.bhbikes.com/download/bancorecursos/manuales/ENG/2026/2026_ULTRALIGHT_ENG_USER_MANUAL.pdf).
Photograph credits and permissions
Photograph 1
Original title: BH G6
Creator: Glory Cycles; creator URI: https://www.flickr.com/photos/glorycycles/
Original source URI: https://www.flickr.com/photos/glorycycles/14245137842/
License / permission: CC BY 2.0
License / permission URI: https://creativecommons.org/licenses/by/2.0/
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