UB-PB228 powerbank

Small powerbank with single 18650 cell. Branded as "URBAN BEATZ".

 5V/1A input and output, 2200mAh capacity - matches markings on LiIon cell.

 Small mounting screws are covered with sticker front.

 TP4213 from Shenzhen TPOWER Semiconductor. Chinese datasheet exists - 1A max, over-temperature protection, overcharge and over-discharge protection, output over-voltage protection, output overload protection, output short-circuit protection.
Preset 4.2V / 4.35V charge voltage with accuracy of ± 1%.
When charging, LED1 flashes (1Hz?), LED1 is always on when the battery is fully charged, LED2 is always on when discharging, LED2 is flashing when discharging low.
LED2 1Hz flashing = low battery. 

 2200 mAh 18650 cell, SZN = Shenzhen?

PCB markings: EC018_v6.1 2014.6.4

I've received this in non-working condition - it was not holding any charge at all. Few sources suggested resetting CID with screwdriver and although using this cell further might be risky it worked. Cell voltage jumped to 4.09V so CID probably "exploded" during charging.