1. Introduction
Motor output and battery capacity influence range, climbing support and how the bike feels across different types of terrain. Understanding the fundamentals helps riders choose a system that suits the distances and conditions they regularly encounter.
2. Batteries and Range Extenders
Battery Capacity and Real World Range
Battery capacity is measured in watt hours and determines how much energy is stored. Range is influenced by:
• rider weight
• terrain type
• elevation gain
• rolling resistance
• temperature
• tyre choice
• assist mode
• cadence
Tools such as the Bosch eBike Range Assistant provide useful estimates.
Range Extenders: What They Are and How They Mount
A range extender is a compact auxiliary battery that increases total capacity when needed.
Most extenders:
• mount in the standard bottle cage position
• attach via the bottle cage bolts or a supplied adaptor plate
• integrate directly with the main battery
They offer flexibility. Riders can keep the bike lighter on short loops and add range for longer rides or increased elevation. They are also convenient to transport.
Depending on the system, the extender may discharge first or both batteries may discharge together in a balanced pattern.
3. Balancing Power, Range & Ride Style
Group Riding Considerations
If your battery capacity is significantly lower than others in your group, you may need to reduce assist levels to complete the ride together.
Larger batteries or bikes that support range extenders help maintain consistent pacing.
Short Distance Rides
For shorter loops, a smaller or mid size battery often provides a more agile and efficient ride feel.
Range extenders give riders the option of additional distance when required.
Lightweight and Full Power Motor Systems
Lightweight systems:
• lower torque
• smaller batteries
• reduced overall weight
• more natural pedalling feel
Full power systems:
• higher torque
• larger batteries
• strong climbing support
Recent systems such as Avinox combine high torque with relatively low weight, creating alternative options between traditional categories.
4. Conclusion
Selecting the right motor and battery system depends on typical ride distances, terrain and personal preference for how much assistance feels appropriate. Understanding these elements helps create a balanced and enjoyable eMTB experience.
For more detail, refer to:
Below are icons which directly link to both full power & lightweight electric mountain bikes so you can find the ebikes best suited to your riding style.
Need any further help in choosing your next bike? Drop us a line on 01254 959345, or alternatively fill out the form below. We'd be glad to help.
Posted by Paul Hoyle on 19th Dec 2025
