Your safety. Our priority.

eBike battery safety

A cyclist on an eBike rides through an impressive cityscape. The dynamic, low-angle shot highlights the contrast between a state-of-the-art curved glass building and historic architecture under blue skies.

Safety is our top priority – including our rechargeable batteries. We show you how we are constantly making our batteries safer. And what you can do to be safer on the road.

The PowerTube 750 is depicted with its internal components exposed.

Mechanical isolation

Single cell of an eBike battery depicted separately.

The individual cells of a Bosch eBike battery are encased in flame-retardant plastic.

Electrical isolation

The integrated protection of the eBike battery cells is depicted in a detached manner.

An integrated fuse at each battery cell provides electrical interruption in the event of increased current flow from a cell.

Thermal isolation

A separating element of the eBike battery cells is depicted in isolation.

Separators reduce the risk of overheating and a potential thermal chain reaction between the cells.

Battery Management System (BMS)

The battery cells' circuit board is depicted in a cropped image.

The intelligent BMS monitors the battery. It detects fault sources and protects against excessive temperatures, overload and deep discharge.

Protection against water ingress

The seal protection of the eBike battery cells is shown separately.

The sealing concept of a Bosch eBike battery protects it against water ingress and therefore against consequential damage.

We develop the batteries for our eBike systems at our headquarters in Reutlingen and produce them mainly at our Bosch plant in Miskolc, Hungary.

Battery safety begins with the selection of the battery cells that we purchase from suppliers. Here, we only work with renowned, certified cell manufacturers.

Many small lilac-colored battery cells in various boxes.

A robot installs the cell holders fully automatically following a voltage check. These encase the cells in flame-retardant plastic so that they are mechanically and thermally isolated.

The robot encases cell carriers in purple plastic. On display are plastic containers, some empty, and some filled with cells.

The cell connector, which is responsible for electrical interruption in the event of an increased current flow in a cell, is then fitted. The interlayer is then fitted onto the individual cell blocks, thermally isolating them from one another.

A robot is securing one cell block, with many other cell blocks visible behind it.

Robots automatically assemble the individual cell blocks, weld them together and connect them to form a battery.

A robot is assembling several cell blocks, with a factory interior visible in the background.

The battery management system (BMS) is installed – automatically by a robot in the case of the more recent batteries. The BMS continuously monitors the status of the battery and checks each individual cell.

On the left, a secured cell block is visible, while on the right, a person is holding a green processor board.

The housing is sealed with a seal and a protective cap. The sealing concept protects against water ingress.

The housing of the PowerTube 625 is secured in a bracket in order to be sealed with a gasket and cover cap.

The battery is placed in specially approved packaging. This provides protection against damage and features the required labelling.

The completed PowerTube 625 battery is placed into a cardboard box.

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How we test

Crush test This test simulates improper use of a battery and must not be replicated.

A battery is loaded with 1000 times its own weight. This allows us to test its safety in the event that strong mechanical pressure is exerted on the battery.

Shaker test

The battery is subjected to vibrations of varying intensity, simulating the load of an entire life cycle on a variety of surfaces. This allows us to test its durability.

Drop test This test simulates improper use of a battery and must not be replicated.

A battery is dropped from a height of one metre onto a concrete block. This allows us to test its robustness against falls or dropping.

Watertightness test This test simulates improper use of a battery. To protect the electronics, you must not clean the battery with direct water jets or even high pressure cleaners.

A battery is subjected to high water pressure of up to 100 bar from various angles. This allows us to test its resistance to water.

Cropped battery back, on which the security warnings can be read with a label.

CE mark

The CE security certificate 'CE' in black.

The CE mark indicates that the battery meets all the relevant EU-wide requirements.

UKCA mark

Black letters on a white background, stacked one above the other: 'UK CA'.

The UKCA mark indicates that a product meets the conformity requirements of the British market.

When buying used batteries, avoid purchasing defective, repaired or stolen products. They may pose a safety risk.

Check your used battery with the help of our battery check when you purchase it. By looking up the serial number, you can immediately see whether a service case has already been registered for that particular battery.

To the battery check

Do not open the battery housing. This is reserved exclusively for qualified and trained personnel. If you do open the battery, you are interfering with its certified state. This poses safety-related risks.

A person stands at a desk, talking on the phone. They're wearing a gray Bosch jacket and using a computer at the same time. In the background, there is a bicycle and some plants.

Exchange instead of repair

eBike batteries are wearing parts. For safety reasons, you should never repair or recondition faulty, old or worn out batteries. Instead, take your battery to a specialist dealer. They will ensure that it is properly recycled.

Find a dealer