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Keeppower P2150TC TYPE-C USB 21700 3.6V 5000mAh Rechargeable Battery
* Quality Protected Li-ion Rechargeable Battery
* Brand: KeepPower
* Part No.: P2150TC
* Maximum Size: (D)21.4*(L)76.7mm(±0.2mm)
* Nominal Voltage: 3.6V
* Nominal Capacity: 5000mAh
* Weight: 75.0g
●  Part No.: P2150TC 
●  Protected 21700 Li-ion Rechargeable Battery
●  Minimum Capacity: 4900mAh
●  Nominal Capacity: 5000mAh
●  Normal Voltage: 3.6V
●  Standard Continuous Charging Current: 1.5A (by USB),2
A (by li-ion battery charger)
●  Maximum Continuous Discharging Current: 8.0A
●  In Built Safety Circuitry
●  Protection Circuit (Against over charge, over discharge, over current and short-circuit.)
●  Charge Voltage by USB: 5V
●  Over 300 charge-discharge cycles

Update with: higher quality button toplights prompt for charging status, better dimension fits for more devices

The voltage and the status of indicators when charge the battery via TYPE-C mount:

The voltage and the status of indicators when discharge via TYPE-C mount: