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Self-assembly battery for rear rack 48V 13s7p 20,3Ah

Self-assembly battery for rear rack 48V 13s7p 20,3Ah

  • Rated voltage: 48V, Rated capacity: 20,3Ah 974Wh
315,49 €
incl. VAT / pc
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deliveries from online stores are free when you order €10.38 are for free.
Free delivery includes parcel delivery to a parcel machine
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Self-assembly battery for rear rack 48V 13s7p

Product for advanced users.


Advantages of assembling the battery yourself:

You save up to several hundred PLN
1. You save up to several hundred PLN on the cost of the battery. An ordinary soldering iron is enough for assembly (we recommend the cheapest soldering station for about PLN 100). We estimate the duration of the assembly at about 1 hour for an inexperienced user. Our service department is there to help and know if you run into any problems.
You gain unique knowledge
2. You gain new, unique knowledge. You know what you buy. You learn how the battery works and how it is built, so you know how to care for it better, and it will repay you with a longer failure-free operation.
You save in the future
3. If you are going to build another electric bike for your family or friends or you will be willing to buy a second battery to increase the range - the ability to build yourself will result in further, even greater savings and another portion of interesting knowledge in the new hobby of electric bikes.

The kit includes:




Suggested place of BMS assembly


To complete the construction of the battery you need:

1m 12 AWG red
1m 12 AWG black
1m 16 AWG red
1m 16 AWG black
15x10cm epoxy with a thickness of 0.2-0.5mm
Heat shrinkable Sleeve 6.4mm x 12cm
Heat shrinkable Sleeve 9mm x 10 cm
XT60 set
0.7 m spiral cable cover
10mm x 20m Kapton tape
1m, 20mm double-sided adhesive tape
100 ml silicone


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

The real capacity of a package (available capacity) is always lower than the nominal capacity of a package (rated capacity of its cells). It is assumed that a ready battery based on a package will have about 10% lower real capacity than the theoretical rated capacity. It is caused by many factors, such as the decrease in the capacity of the cells under load, or leaving the unused capacity by the BMS (discharge to the minimum cell voltage to about 2.7V) in order to extend the life of the battery.

Charging socket
DC 2.1/5.5
Cell configuration
Maximum discharge current
35A (maximum performance of the connected controller)
Maximum charging current
2.5A (maximum efficiency of the charging socket)
Rated voltage
Rated capacity
20,3Ah (about 19Ah available)* 974Wh
Cell type
Samsung INR18650-29E
Estimated range

- at a speed of 25 km/h
- no wind, on flat asphalt
- without power assist, driving "on the throttle"

6,5 kg
on a professional welding machine, tape pure nickel 100%
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