I've got a

**Boston-Power Swing 5300**cell tested and want to share the results with you.

The cell was bought from

**Queen Battery**, a Chinese supplier of genuine batteries, who specializes mainly on EV and eBike market. Queen Battery has a branch in Europe which works with european customers like me:)

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**

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. 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?