The Bosch PowerTube 625 is a 625 Wh lithium-ion battery built for electric bikes (pedelecs) running a Bosch eBike drive system. It mounts inside the down tube of the frame and comes out again for charging. Nominal voltage is 36 V, capacity is roughly 17.4 Ah, and the pack weighs about 3.5 kg.
This is a drive-system component, not a standalone motor or vehicle. It feeds the mid-drive motor mounted at the bottom bracket and works together with the handlebar controller as one integrated system. Therefore, it fits only bikes that already carry a Bosch eBike drive.
Two details decide fitment. First, the PowerTube 625 comes in horizontal and vertical mounting versions. Second, there are two generations: the classic BES3 platform and the newer smart system. These generations are not cross-compatible, so check your bike and motor before ordering.
Key Benefits
- Integrated BMS – the battery management system tracks cell voltage, current and temperature, and balances the cells.
- Built-in protection – the BMS guards against overcharging, deep discharge and short circuits.
- 625 Wh capacity – a large energy reserve, so range depends mainly on your riding conditions.
- Long service life – even energy draw and an optimised cell resource extend usable battery life.
- In-frame integration – the pack hides inside the down tube, which keeps the bike’s lines clean.
- Removable design – lift it out and charge it away from the bike whenever that suits you.
- Two mounting versions – horizontal and vertical options cover different frame constructions.
- 36 V nominal voltage – the standard operating voltage of the Bosch eBike drive system.
Who Is This Battery For?
The PowerTube 625 suits electric bikes with a Bosch mid-drive motor. That includes bikes built around Performance Line, Performance Line CX, Active Line and Cargo Line motors. These drives appear on bikes from Haibike, Cube, Trek, Riese & Müller, Scott and KTM.
In practice, the battery covers daily commuting, longer touring routes and cargo e-bikes carrying weight. Riders usually buy it for one of two reasons. Either an existing PowerTube pack needs replacing, or a second battery makes longer rides practical.
Before you choose, confirm two things. A classic BES3 pack will not run a smart system bike, and the reverse is equally true. Likewise, a horizontal-mount version will not seat in a vertical frame slot.
Technical Specifications
| Model | Bosch PowerTube 625 |
| Type | In-frame electric bike battery |
| Capacity | 625 Wh |
| Capacity (Ah) | Approx. 17.4 Ah |
| Nominal voltage | 36 V |
| Cell type | Lithium-ion cells |
| Battery management | Integrated BMS |
| Weight | Approx. 3.5 kg |
| Mounting | Down tube, horizontal or vertical version |
| Removable | Yes, for charging |
| Generations | BES3 classic or smart system |
| Charging | Bosch eBike charger (2 A / 4 A / 6 A) |
| Manufacturer | Bosch eBike Systems |
Why Choose the PowerTube 625?
The difference between PowerTube and PowerPack comes down to mounting. PowerTube sits hidden inside the frame, while PowerPack bolts on externally to the frame or the rear rack. Both types come out for charging. Riders pick PowerTube for the integration and the tidier look.
Meanwhile, the integrated BMS manages how the pack works and balances the individual cells. Energy therefore flows steadily, and the battery’s resource is used more evenly across its life. That matters for safety as much as for longevity.
This is an original Bosch eBike Systems component. As a result, it works with the factory drive unit, the handlebar controller and the frame lock without modification or adapters.
Frequently Asked Questions
What is a BMS and why does it matter?
- The battery management system monitors cell voltage, current and temperature.
- It balances the cells so energy is used evenly.
- It also protects against overcharging, deep discharge and short circuits.
Which bikes does the PowerTube 625 fit?
- Electric bikes with a Bosch eBike mid-drive system.
- Bikes using Performance Line, Performance Line CX, Active Line or Cargo Line motors.
- Models from Haibike, Cube, Trek, Riese & Müller, Scott and KTM, among others.
Will a BES3 battery work with a smart system bike?
- No. The two generations are not compatible with each other.
- A smart system pack likewise will not run a classic BES3 bike.
- Check your motor and display generation before ordering.
How do I know whether I need the horizontal or vertical version?
- The version must match the frame slot on your bike.
- A horizontal-mount pack does not fit a vertical down tube slot.
- Look at how your current battery seats in the frame.
Can the battery be removed for charging?
- Yes. It lifts out of the down tube and charges separately.
- You can also charge it while it stays on the bike.
- Charging uses a Bosch eBike charger rated at 2 A, 4 A or 6 A.
How much does the PowerTube 625 weigh?
- Around 3.5 kg for the complete pack.
- Capacity is 625 Wh at 36 V nominal voltage.
- That works out to roughly 17.4 Ah.
What range can I expect?
- The 625 Wh reserve is large, so range depends on riding conditions.
- Terrain, rider weight, assistance level and tyre pressure all play a part.
- No fixed distance applies to every bike or every route.
Is this an original Bosch part?
- Yes, it is a Bosch eBike Systems component.
- It pairs with the factory motor, controller and frame lock.
- No rewiring or adapters are needed.
The Bosch PowerTube 625 gives Bosch-equipped pedelecs a 625 Wh energy reserve inside the frame, with an integrated BMS handling protection and cell balancing. Match the generation and the mounting direction to your bike, and it drops straight into the factory system.
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