FST 20650-3350mAh Specifications
20650 · NMC — full datasheet specs for the FST 20650-3350mAh, plus what it delivers in common DIY pack configurations. Plan a build with it in the Battery Pack Calculator.
At 3350 mAh it ranks #1 of 1 20650 cells in our database by capacity — one of the higher-capacity 20650 options.
Full specifications
| Capacity | 3350 mAh |
|---|---|
| Nominal voltage | 3.6 V |
| Max charge voltage | 4.2 V |
| Discharge cutoff | 2.8 V |
| Energy | 12.06 Wh |
| Max continuous discharge | 6.7A |
| C-rate (continuous) | ≈2C |
| Internal resistance | 35 mΩ |
| Standard charge current | 1675 mA |
| Standard discharge current | 1675mA |
| Chemistry | NMC |
| Form factor | 20650 |
| Wrap color | Blue (Dark) |
| Insulator ring | White |
At the standard 1675 mA charge rate, a full charge takes roughly 2 hours plus the constant-voltage taper at the end.
The 20650-3350mAh in a battery pack
Common DIY series configurations using this cell's real 3.6V nominal voltage, with a 3-cells-in-parallel (3P) example for capacity:
| Config | Nominal voltage | Fully charged | Cells (3P) | Capacity (3P) | Energy (3P) | |
|---|---|---|---|---|---|---|
| 3S | 10.8 V | 12.6 V | 9 | 10.1 Ah | 109 Wh | |
| 7S | 25.2 V | 29.4 V | 21 | 10.1 Ah | 253 Wh | |
| 10S | 36 V | 42 V | 30 | 10.1 Ah | 362 Wh | |
| 13S | 46.8 V | 54.6 V | 39 | 10.1 Ah | 470 Wh | |
| 14S | 50.4 V | 58.8 V | 42 | 10.1 Ah | 507 Wh |
Size a full pack around the 20650-3350mAh — voltage, capacity, runtime, and BMS:
Open the Battery Pack Calculator →or balance tested cells in the Pack BuilderGet new tools and build tips
We are always adding tools, cell data, and guides. Drop your email for new tool releases and battery-building tips. No spam, unsubscribe anytime.
Specs come from manufacturer datasheets and independent testing; Mooch-tested discharge ratings are shown when available because they reflect real continuous performance better than headline datasheet numbers. Browse the full 18650 & 21700 cell database to compare every cell.