Self-assembly battery - Polly DP-21700-7 48V 13s5p 25Ah with charger and BMS
- Rated voltage: 48V, Rated capacity: 25Ah 1200Wh
Self-assembly battery - Polly DP-21700-7 48V 13s5p 25Ah with charger and BMS
Product for advanced users.
The maximum discharge current is 35A
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 template
Advantages of assembling the battery yourself:
You save up to several hundred PLN
You gain unique knowledge
You save in the future
The kit includes:
BATTERY PACKAGE 13S 5P
Lithium-ion package. It is the main element for building a battery. After soldering the correct BMS, it is ready to work.
The type of cells used to build the package: LG M50T (5000mAh)
BATTERY CASEPOLLY DP-21700-7
The housing includes a 5.5 / 2.1 charging socket.
The set also includes a mounting rail.
BMS
During charging, it balances and aligns individual sections so that they do not exceed the maximum safe voltage of 4.2V / cell. It automatically cuts off the charger if any of the cells are close to being reloaded.
During discharge, it makes sure that we do not discharge the battery too deep. In the event that any of the cells is already discharged - the BMS will cut off the power supply to the bike in order not to damage the batteries.
He tries to align the cells so that they always have the same voltage. This extends the service life and failure-free operation of the entire power supply.
CHARGER 13S 2A
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.
ADDITIONAL ACCESSORIES
Additional accessories include: 4 washers for mounting the DP-9 battery case to the bicycle frame, keys and a set of mounting screws.
Suggested place of BMS assembly
ASSEMBLY OF THE BMSA
Recommended location for BMS (pictured).
Maximum BMS thickness: 8mm
Laser cut pure nickel plates.
PURE NICKEL PLATES
The package is welded on 8x0.15 thick pure nickel plates, laser cut.
Technical data:
| PARAMETER | UNIT |
|---|---|
| Rated voltage: | 48V |
| Rated capacity: | 25Ah 1200Wh |
| Cell type: | LG M50T (5000mAh) |
| Cell configuration: | 13s5p |
| Maximum discharge current: | 35A (maximum performance of the connected controller) |
| Maximum charging current: | 2.5A (maximum efficiency of the charging socket) |
| Charger port: | DC 2.1 / 5.5 |
| Weight: | 5,9 kg |
| Dimensions: | 156x95x367mm |
| Welding: | on a professional welding machine, tape pure nickel 100% |
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
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.
How to install the battery?
