This was the second build by AD6DM using K2 High-Drain 26650 cells. This time in 4S3P configuration for 8.55Ah of capacity. Created in June of 2019, AD6DM uses this battery for personal use even today.
This battery incorporated more solder practice and liberal use of flux, creating a better bus bar solder experience. Since the cells are new, there was little concern with the 3-in-series configuration and mismatched cells.
General Specs:
Cells: K2 26650 2.85Ah 3.2v LiFePO4 (capable of 150A pulse max)
BMS: HX-4S-F100A
Configuration: 4S3P
Total Rated Capacity: 8.55Ah
Current Owner: AD6DM Dennis
Cell Specs:
Brand: K2
Model: LFP26650P
Capacity: 2850mah
Watt Hours: 9.4
Nominal Voltage: 3.2
Fully Charged Voltage: 3.65 (recommended), 4.1 (maximum)
Fully Discharged Voltage: 2.5 (recommended), 2.0 (maximum)
Continuous Discharge (A): 42
Pulse 30 Seconds Discharge (A): 50
Short Pulse Discharge (A): 150
Charge Current (A): 5
BMS Specs:
1. Continuous discharge current: 100A
2. Instantaneous discharge current: 120A
3. Charging Voltage: Iron lithium charger 14.8V (Switching power supply: 15V-16V)
4. Charging Current: 10A(Max)
5. Overcharge detection voltage: 3.75V±0.05V
6. Over charge detection delay time: 1300 ms
7. Over charge release voltage: 3.6V±0.05V
8. Electricity equalization detection voltage: 3.6V±0.05V
9. Electricity equalization release voltage: 3.59V±0.05V
10. Electricity equalization current: 58mA
11. Over discharge detection voltage: 2.1V±0.08V
12. Over discharge detection delay time: 145s
13. Over discharge release voltage: 2.30V±0.1V
14. Over current detection voltage: 200mV
15. Over current detection delay time: 20mS
16. Over current protection current: 120A±10A
17. Over current protection release: Cut off the load
18. Detection condition: Exterior load short circuit
19. Detection delay time: 300us
20. Over current protection: Cut off the load
21. Temperature Protection: Can use an external temperature switch
22. Main circuit conduction resistance ~20mΩ
23. Working current: ~30uA
24. Working Temperature: -20C-80C
25. Size: 70 x 60 x 8.5mm
