Part / accessory · Bosch

Bosch PowerTube 750 horizontal (the smart system)

verified 2026-10-13 Specs from Bosch eBike Systems batteries page. Also known as: powertube 750 horizontal, bbp3770.

Specs

wh	750
capacity ah	20.1
voltage	36
mount	in-frame PowerTube, horizontal
system	Bosch smart system
dualbattery	Yes
weight kg	4.3
length mm	484

e-bike battery Bosch smart system PowerTube (horizontal-insertion version)
Bosch smart-system in-frame PowerTube batteries in the horizontal version (500, 625, 750 Wh).

Ask about a specific device and get a verdict with evidence.

Connect the Tethered Trust MCP server and ask: "Will the Bosch PowerTube 750 horizontal (the smart system) work with my device?"

https://tetheredtrust.com/mcp

Good to know

PowerTubes are built into the down tube and the frame is designed for one length: Bosch lists smart-system PowerTube 500 at 345 mm, 625 at 415 mm and 750 at 484 mm long. A different capacity only fits if the bike maker approves it for that frame.
Horizontal and vertical PowerTubes are separate versions (different part numbers, e.g. PowerTube 750 BBP3770 horizontal / BBP3771 vertical per Bosch's manual); buy the orientation your frame uses.
PowerTube 500 and 625 also exist for Bosch eBike System 2 under the same names; those do not fit this interface.
Bosch: 'Use only original Bosch batteries that the manufacturer has approved for your eBike' and 'Only charge the battery using original Bosch chargers'; Bosch warns other batteries/chargers can be a fire hazard (Bosch PowerTube 750 operating instructions, as hosted on ManualsLib).

8 models in the graph.

Informational only. Confirm with the manufacturer before buying or installing. Spotted a mistake? Report it.