50k PD401120 3.7v 50mAh small size lithium polymer battery were sent to UK, its typical small battery for bluetooth, headsets device, this battery is a hot battery with many orders each month from Europe and USA because of its ultra small size, safety, light weight(only 2g), long cycle life, no harm to environment.

Its specs as below:

Model: PD401120
Battery type: Lithium polymer battery
Voltage: 3.7V
Capacity:50mAh
Impidence: 420mΩ
Discharge cut off voltage:3V±0.05V
Charge cut off voltage: 4.2V±0.05V
Standard discharge current: 0.2C
Max constant discharge current:2C
Standard charge current: 0.5C
Max charge current: 1C
Dimension: 4mm thickness *11mm width *22.5mm height/length
Weight: 2.0g