City kit
Trekking kit
Our bestseller
Self-assembly battery - Battery Pack 48V 20,3Ah + CHARGER(V4)
- Rated voltage: 48V, Rated capacity: 20,3Ah
- Case: Polly DP9, Configuration: 13s7p, Cells: Samsung 29E S6
Write your opinion
Self-assembly e-bike battery - Battery Pack 48V 20,3Ah + CHARGER
A product for beginner users.
The package has marked fields for BMS mounting, which will make it very easy to finish the battery construction and have video instructions. The kit also includes all the necessary components for assembly (wires, tapes, etc.)
Universal silicone to immobilize the package and seal the housing
The bolts that attach the battery case rail to the bike
You do not know if the battery case will fit into your bicycle frame? Download the templates and print it in a 1:1 scale, after printing, check that both marked dimensions of 50mm are consistent with reality, otherwise the housing could be printed in a different scale and the dimensions will not match.
Download the battery template for the try-in on the bicycle frame - Click here
Advantages of assembling the battery yourself:
You save up to PLN 400
1. You save up to PLN 400 on the cost of the battery. The assembly is easy, no specialist knowledge is required, we attach simple and convenient "Step by step" instructions. 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:
CELL PACKAGE 13S 7P
Lithium-ion package. It is the main element for building a battery. After soldering the correct BMS, it is ready to work.
Cell type: Samsung INR18650-29E
Estimated range: 97km
- at a speed of 25 km / h
- no wind, on flat asphalt
- without power assist, driving "on the throttle"
CHARGER 13S 2A 54,6V DC 2.1/5.5
Fast automatic charger for LiIon and LiPoly batteries (lithium-ion and lithium polymer). No configuration required, it works straight away. After the battery is charged, the charger switches to standby.
We recommend not to exceed 2A of the charging current (for small batteries), e.g. with a different charger.
2A is the maximum current that does not degrade this battery. We also remind you that properly used battery should be charged after each ride, which significantly extends its life. Thanks to this habit, the 2A charger will recharge it in a short time and in optimal conditions.
BATTERY CASE
The housing is roomy enough that it allows you to use all 91 baskets for cells, and it will also fit BMS inside
BMS
Battery management system (BMS) - it is a device that automates the entire process of using batteries. After connecting a suitable charger to the BMS, it monitors its proper charging and discharging. It is an integral part of a properly constructed electric bike.
Lithium batteries (lithium ion, lithium polymer and others) are serviceable and require care and attention. They cannot be charged above 4.2V per cell and discharged below 3V per cell. In order to supervise them in everyday use, a device called BMS was invented.
ACCESSORIES FOR BATTERY BUILDING
- red wire 12 AWG - 1m
- black wire 12 AWG - 1m
- red wire 16 AWG - 0.5 m
- black wire 16 AWG - 0.6m
- epoxy glass, insulator - 12.5mm x 12.5mm
- thick thermo tube - 10.0mm 1 x 12cm
- medium thermo tube - 6.4mm 1 x 12cm
- xt60 connector set
- double-sided adhesive tape
- kapton tape
- spiral, cable cover - 0.65 m
WASHERS
A set of 4 washers for mounting the battery case G91 to the bicycle frame.
Laser cut pure nickel plates
PURE NICKEL PLATES
The package is welded on 8x0.15 thick pure nickel plates, laser cut.
Must see - E-bike Academy
See the video from the assembly of the battey performed by "Tas Tasowski". Find out how to build a battery yourself in the video below.
13s7p battery building instruction | E-bike Academy
Note:
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.
If your BMS has a turn-on circuit (two white wires) and it is disconnected (wires are not short-circuited) then it needs to be connected (short-circuited) to turn on the BMS.
How to install the battery?
Brand
Cell configuration
13s7p
Maximum discharge current
30A
Rated voltage
48V
Rated capacity
20,3Ah (about 19Ah available)* 974Wh
Cell type
Samsung INR18650-29E
Weight of the finished battery with the rail
5,5 kg
Dimensions
370x140x90mm
Charger included
LiIon, 54,6V DC 2.1/5.5
Welding
on a professional welding machine, tape pure nickel 100%
Cells type
18650 new, unpackaged, 0 cycles
