For this CMOPOL-GH PD-63 60,000mAh powerbank:
Battery Type: Lithium Polymer (Li-Polymer)
- Capacity: 60,000mAh / 3.7V (222Wh)
- Cell Type: Rechargeable Lithium-ion Polymer - more stable and high capacity
- Built-in Protection: Over-charge + Over-temperature protection (written on box)
It's the flat, high-density battery type they use for big fast-charge powerbanks - not the small 18650 round cells.