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Downtube battery for e-bike 48V 21Ah 1008Wh MJ1 B4.M - 101 km
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Downtube battery for e-bike 48V 21Ah 1008Wh MJ1 B4.M - 101 km

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Downtube battery for e-bike 48V 21Ah 1008Wh MJ1 B4.M - 101 km
Downtube battery for e-bike 48V 21Ah 1008Wh MJ1 B4.M - 101 km
Rated voltage:48V
Rated capacity:21Ah 1008Wh
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After purchase you will receive 254.90 pts.
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Downtube battery 48V 21Ah 1008Wh


Battery 48V

Battery for the motor with max. power

Range Eco

Approximate range in summer at 25-27 km/h and 20% motor assistance:

126 km
Range Standard

Approximate range in summer at 25-27 km/h and 50% motor assistance:

101 km

We provide the highest quality

Documentation - The battery complies with international safety standards and environmental regulations. It has a CE certificate, which means that it meets the legal requirements of the European Union. It also contains an MSDS document which provides information on chemical composition, hazards and safety procedures. The UN38.3 certificate confirms that the product has passed tests related to the safe transport of lithium batteries. Additionally, the battery meets the EMC 2014/30/EU standards regarding electromagnetic compatibility and is compliant with the international standard IEC 62133-2-2017 which specifies the safety requirements for batteries used in portable devices.

Performance - NEW Li-ion LG INR18650MJ1 cells with a capacity of 3500mAh ensure the longest possible battery life and maximum range.

Safety - The battery is maintenance-free because all control over its operation is exercised by the BMS (Battery Management System). The built-in BMS with a power of 30A protects the battery against excessive discharge and overcharge, optimizes battery operation and balances the voltage between individual cells.

Simple assembly - The battery case includes a rail with holes intended for installation in a bicycle frame. Additionally, the set includes rivet nuts and screws enabling strong installation of the battery. Additional stabilization on the frame is provided by 4 plastic pads.

Convenient use - Slide the battery into the rail and lock it before sliding out by turning the key. With one move, we can also dismantle the battery and move it to another place for e.g. charging or transport.

Full control - The battery has a built-in battery charge indicator that allows you to quickly determine the remaining range of the bike.


The battery fits the sets:

Kit City XP03

Power adjustment - 250W-1000W

Max speed - 35km/h

Kit City Mxus XF15

Power adjustment - 250W-1000W

Max speed - 35km/h

Kit Trekking XP04

Power adjustment - 250W-1350W

Max speed - 40km/h

Kit Trekking Mxus XF15 FAT

Power adjustment - 250W-1350W

Max speed - 40km/h

Kit Trekking Mxus 30H

Power adjustment - 250W-1500W

Max speed - 50km/h



Do not connect this battery model to the Mxus 3K Turbo 3000W MTB kit..

You don't know if the housing will fit your bike frame? Download the templates and print in a 1:1 scale. After printing, check whether both marked dimensions of 50 mm are consistent with reality, otherwise the casing could have been printed in a different scale and the dimensions will not match.

Download the battery template for fitting in a bicycle frame - - Click here

Remember to connect the charger to the batteries in the correct order. ALWAYS first connect the charger to a 230V socket and then to the charging socket. DO NOT connect upside down. This may quickly damage both the charger and the BMS installed in your battery. The reverse connection causes the effect of sudden charging of the charger's output capacitors through the BMS socket. This is accompanied by the flow of huge current that can damage the plug, socket, BMS mosfets or even charger transistors.

The real capacity of the pack (available capacity) is always smaller than the rated capacity of the pack (rated capacity of the cells it contains). It is assumed that the finished battery based on the package will have approximately 10% less real capacity than the theoretical rated capacity. This is caused by many factors, such as a decrease in cell capacity under load, or the capacity left unused by the BMS (discharge to the minimum cell voltage of approximately 2.7V) in order to extend the battery life.

Maximum supported current and connection to the controller: 30A, XT60 connector (female) Remember that XT60 connectors are not waterproof, place the connection to the controller in a water-resistant place.

Battery protection: The safety of the package is ensured by the BMS system, which protects against excessive discharge and overcharge. Additionally, it balances the package, increasing its range and durability.

Be sure to see - Nexun E-bike Academy

Watch the video of the rail assembly performed by "Tas". Learn how to install a battery rail on a bicycle frame by watching the video below.

Miniatura YT

Installing a rail in a bicycle frame | Nexun E-bike Academy

Charging socket
DC 2.1/5.5
Cell configuration
Maximum discharge current
Maximum charging current
Rated voltage
Rated capacity
21Ah 1008Wh
Cell type
LG INR18650MJ1
Estimated range
101 km
Cells type
18650 - NewMore

The cells used to construct this battery are brand new, come directly from production and are not used or recycled. They provide the longest possible battery life and maximum range.

5 kg
on a professional welding machine, tape pure nickel 100%
24 months for consumers, 12 months for companies

Each battery in the online store is covered by a 24-month warranty for consumers and a 12-month warranty for companies.

The warranty covers:
- Cell damage
- BMS damage
- Capacity decline (over 15% per year)

The warranty does not cover:
- Errors in assembly that do not comply with the instructions or workmanship
- Improper maintenance
- Mechanical damage (cracked/broken casing, melted connection terminals, etc.)
- Changes in the product's operating characteristics depending on weather conditions (temperature)
- Water damage


To maximize battery life, use the following recommendations:
1. Fully charge the battery after each ride
2. Fully charge the battery every 3-4 weeks when you do not use it, e.g. winter break.
3. In the autumn and winter (temperature below +12*C), lithium-ion batteries have a lower capacity (by max. 30%) than in the summer, which results in a shorter range. This is normal. During this period, do not use the full power for the first 10-15 minutes of riding.
4. Do not charge the battery with a current higher than 3A.

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