Boston-Power is a US based manufacturer of Li-ion cells which makes them in China and Taiwan and supplies to NASA, HP, ASUS, Delfast eBike and EV makers.
The cell was bought from Queen Battery, a Chinese supplier of genuine batteries, who specializes mainly on EV and eBike market.
The Boston-Power Swing 5300 is a 3.65V Li-ion cell with a wide working temperature range (-40 to +70°C) and impressive cycle life (1000-3000 cycles).
Specifications of Boston-Power Swing 5300 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
Weight: 93g
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. For those who think this is a double 18650 i took the heat shrink tube off to show the bare cell:
The cell was bought from Queen Battery, a Chinese supplier of genuine batteries, who specializes mainly on EV and eBike market.
The Boston-Power Swing 5300 is a 3.65V Li-ion cell with a wide working temperature range (-40 to +70°C) and impressive cycle life (1000-3000 cycles).
Specifications of Boston-Power Swing 5300 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
Weight: 93g
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.
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. For those who think this is a double 18650 i took the heat shrink tube off to show the bare cell: