SPECIFICATIONS:
| Manufacturer: | Efest |
| Size: | 21700 |
| Style: | Flat Top |
| Protected: | NO, UNPROTECTED. This cell is unprotected and intended for use in protected battery packs only and NOT individually or as a standalone product. In order to operate safely it must have additional protection in the form of a PCB (protection circuit board) or BMS (battery management system), which is not included. |
| Nominal Capacity: | 4000mAh |
| Discharge Current: | 30A Maximum Continuous |
| Nominal Voltage: | 3.7V |
| Maximum Voltage: | 4.2V |
| Approximate Dimensions: | 21.3mm x 70.2mm |
| Approximate Weight: | 66.37g |
| Origin: | China |