The range of an e-bike, meaning how far you can ride on a single battery charge, is influenced by many factors. These include the rider’s weight, the terrain (such as hills and elevation changes), the surface (asphalt, gravel, wet or dry), weather conditions (wind, rain, temperature), and tire pressure. The level of motor assistance, selected gear, pedaling cadence, riding style, average speed, riding position, and the number of stops per trip also play a role. Even the condition of wear-and-tear components and the age and capacity of the battery can significantly affect the range. The more efficiently you ride, the farther you’ll go.

Stromer e-bike: Storage of the e-bike battery

To store the battery of your Stromer e-bike, in winter for example, we have developed the battery bag, which fits all Stromer batteries (except the BQ1440). The special, fireproof fabric combination offers safe protection during transport and storage as well as additional safety during charging of the battery.

Important notes on the long-term storage of your e-bike battery:

• Store the e-bike battery in a dry place at room temperature (10 – 25 °C). The permissible storage temperature range of -20 – 60 °C must be maintained.
• The charge status for long-term storage should be between 40 % and 80 %. This should be checked regularly (every 4 – 8 weeks) to prevent deep discharge.
• Do not store the e-bike battery together with metal objects.
• Protect the e-bike battery from direct sunlight, water and other liquids.
• Never store several batteries stacked or next to each other.

You can order the battery bag from your dealer.

The battery capacity refers to the stored amount of electricity of a battery and is give in the unit ‘Ah’ (ampere hour). It also determines how long the battery can be used: A battery with one ampere hour can transfer a charge of one ampere for an hour.

For the range of an e-bike or Speed Pedelec, however, it is not the battery capacity that is decisive but instead the energy in ‘Wh’ (Watt hours). The range depends greatly on a number of parameters such as weight, topography and altitude difference, road conditions and surface, temperature, weather, wind, tire pressure, assistance level, shifting system, cadence, riding style, condition of the wear parts, air resistance, riding position or the number of stops per ride.

Stromer E-Bike: Battery discharges itself

If you store your Stromer Speed Pedelec in anti-theft mode (locked mode), the anti-theft mode uses power and the battery will be empty after about 10 days. The anti-theft mode was developed to park the bike for a short time, for example while shopping. It is not suitable for monitoring the Speed Pedelec for an extended period of time. If it will be parked for a longer period, you should therefore switch off the bike and additionally secure it with a lock.

The battery management system (BMS) also consumes a small amount of power, slowly discharging the battery. If you do not use your bike for a longer period of time, we recommend connecting the bike to the charger CR246, which offers the option of a floating charge.

The floating charge automatically keeps the battery in the optimal charging range. This means that the charging process is stopped after a full charge until the charge level of the battery has fallen back to around 60 % after about 3 weeks. The charge level is then maintained at 65 – 80 % until the charger is disconnected from the battery.

Like all types of batteries, lithium-ion batteries also exhibit unavoidable self-discharge. This type of discharge depends primarily on the temperature but also on the charge status and age of the battery. Over extended periods, or even due to excessively long storage of a battery not charged sufficiently beforehand, there is a risk of the cell voltage dropping below a required minimum value. This is called deep discharge and generally leads to irreversible damage to the cells and thus to a total failure of the battery. Even a modern battery management system (BMS) is not capable of preventing this issue. In practice it is recommended to store a lithium-ion battery with a charge status of approx. 40–60 % in a dry and cool (15–20 °C) place depending on the length of planned storage (often over the winter). If being stored for longer, the charge status should be checked every 4–8 weeks and recharged, if necessary.

One charging cycle is the complete charging and discharging process of the battery. Incomplete charging or discharging is referred to as a partial charge. Because an entire charging cycle is rarely performed, if ever, because charging is practically never performed from 0 to 100 %, we don’t refer to charging cycles for our batteries but instead to the “state of health”. This takes into account much more than just the charging processes: For this reason, the state of health must not fall below 75 % during the 24-month warranty on the battery. This state of health of the battery can be tracked in the Stromer OMNI app.

Stromer e-bike regenerative braking

Your Stromer supports you when braking during longer downhill runs and offers the regenerative braking mode for this purpose. On the one hand this can be used as a motor brake to protect the brakes when riding downhill, and on the other hand it returns power to the battery.

The difference between the regenerative braking modes “Recup 1” and “Recup 2” is the strength of the regenerative braking.

If you set the assistance to “zero” and press the minus button once, “Recup 1” will switch on. If you press the minus button again, “Recup 2” switches on.

“Recup 1” is used for light downhill runs and “Recup 2” for steeper downhill runs. If you ride with a full battery, the regenerative braking is inactive to protect the battery.

Stromer e-bike: LED indicators on the charger

• LED on the charger lights up green: Battery is fully charged.
• LED on the charger flashes green: Battery is charging.
• LED on the charger does not light up: Check whether the charger is correctly connected to the power network.
• The LED on the charger lights up orange: Battery is not charging; an error has occurred.
• LED lights up red with battery connected: The battery is not recognized by the charger. Check the connector between the charger and the battery.

Important:

• Avoid charging processes at over 40 °C or in hermetically sealed rooms.
• Avoid water, moisture, dust or proximity to flammable materials.
• Always place the charger on a secure and stable surface.
• Do not charge the battery if the housing of the battery or charger displays any cracks or fractures.

The «Deep Sleep Mode» is a function that preserves battery energy depending on either the state of charge or significant inactivity.

Step-by-step guide

First connect the charger to the power mains (LEDs light up red and green) and then to your Stromer. The connection for the charging cable is located on the left side of the down tube, slightly below the connection to the head tube. Open the cover of the charging socket.

1. Connect the Stromer charger to the power mains. The integrated LEDs light up in red and green.
2. Hold the charging cable loosely in your hands and slowly move it near the socket of your Stromer. The magnets will help you to position the plug correctly.
3. Connect the charger with your Stromer. The LEDs in the charger light up in orange and green during the wake-up process. When the wake-up process is finished, you will hear a click sound from the charger.

Stromer E-Bike: Regenerative braking

During regenerative braking, the braking energy is recuperated. This principle involves the energy released during braking or in coasting mode being converted into electrical energy by means of recuperation by the generator. This energy is stored in the battery and used for acceleration. The range of the Stromer batteries can be increased by up to 20 % through regenerative braking. Regenerative braking can also be used as an engine brake when driving downhill, provided the battery is not fully charged.

Stromer e-bike battery: battery types, care, range and disposal

Stromer e-bikes are equipped with a high-performance lithium-ion battery. This supplies energy to the drive system and all the other electronic components. The battery management system (BMS) developed by Stromer provides overvoltage and undervoltage protection and optimizes the service life of the lithium-ion battery.

Care
You can fully recharge the battery of your Stromer e-bike after every ride. This increases the battery life and you are always ready for the next trip. There is no need for you to run down the battery every time, there is no memory effect. Top up your battery charge as often as possible, do not let it run down to empty and recharge it even if it has only been in use for a short period of time.

Range
The Stromer e-bike batteries are available in different versions. See the overview and model compatibility here.

Disposal
Do not dispose of Stromer batteries and chargers in domestic waste. Get to know the valid national regulations on the disposal of old equipment and batteries. Take used battery chargers and the battery back to your Stromer dealer. In most countries dealers are obliged to take back electrical appliances and batteries.