I've got a Boston-Power Swing 5300 cell tested and want to share the results with you.
- [+] About Boston-Power
- Boston-Power is a US based manufacturer of Li-ion cells which makes them in China and Taiwan and supplies to HP, ASUS and EV makers.
The Boston-Power Swing 5300 is a 3.65V Li-ion cell with a wide working temperature range (-40 to +70°C).
Specs taken out of it's datasheet:
Nominal capacity: 5300mAh (at 0.2C discharge)
Nominal energy: 19.3Wh (at 0.2C discharge)
Nominal cell impedance: 16 mΩ
Life cycle at 100% DOD: >1000 cycles (at 1C discharge)
Discharge cut-off voltage: 2.75V
Max continuous discharge rate: 13A
Standard charging current: 3.7A, cut-off at 0.05A
Max continuous charge rate: 10.6A
Charging temperature: -20 to +60°C
Discharging temperature: -40 to +70°C
Dimensions: 37.2 x 64.8 x 19.1mm
I've tested with ZKETECH EBC-A20 and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A.
I've tried to follow all the prescriptions of the IEC61960-2003 standard concerning battery's capacity measurement. Before each discharging cycle the battery was charged at 3.7A to 4.2V (cut-off at 0.1A, which is higher than 0.05A allowed by the manufacturer, but it's the lowest supported by EBC-A20). Before each discharging or charging i've held a 1-1.5hrs pause. The environment temperature was 21-23°C.
Discharge cut-off voltage was 2.75V in all cases. I've done a 0.2C (1.06A) discharging to check the nominal capacity, then I've discharged at 5.0 and 10.0A and finished with the max allowed continuous discharge current - 13A.
The results i've grouped together, so it must be easier to compare them.
As turned out, the battery is not overrated and at 0.2C it gives out 5318mAh - a lil bit more than the nominal capacity. The amount of energy is also slightly higher than the nominal - 19.36 vs 19.3Wh.
At 5.0A the capacity is lower than at 10.0A, but the amount of energy is higher. This is a normal thing, and the important one is the amount of energy.
At 13.0A the measured capacity was 5091mAh and the energy - 16.48Wh.
The results are good and not surprising for me. This is a high quality cell which can give out almost 5100mAh/16.5Wh at 13.0A. In some cases the prismatic form is preferable than cylindrical and i think it will help to build battery packs with higher energy density than in case of using 26650 cells with ~5000mAh capacity.
P.S. This is my first post on Endless-sphere and i hope not the last Please tell me what do you think about this review/test, what did you like or didn't like and would you like to see tests of other batteries done in similar way?