Samsung SDI INR21700-50GB

The Samsung INR21700-50GB is an updated version that includes a bottom vent as well as a new top vent design. The new top vent features a "cup and septum" design. This means that the top of the battery has a raised cup-like structure with a small hole, and there is a thin septum or membrane covering the hole. The septum is designed to rupture when the pressure inside the battery reaches a certain level, allowing gas to escape. Compared to the original top vent design, the cup and septum design has some advantages. For one, it provides more reliable and consistent venting performance, as the septum is less likely to become blocked or obstructed compared to a standard vent. The new design also reduces the risk of electrolyte leakage and contamination, as the septum helps to seal the battery and prevent the electrolyte from leaking out. Overall, the new top vent design provides improved safety and reliability compared to the original model.

Nominal specifications (*¹)
Item Specification
3.1 Standard discharge Capacity
Min 4,900mAh
- Charge : 0.5C(2,450mA), 4.2V, 0.02C(98mA) cutoff @ RT
- Discharge : 0.2C(980mA), 2.5V cutoff @ RT
* 1C = 4,900mA
3.2 Rated discharge Capacity
Min 4,753mAh
- Charge : 0.5C(2,450mA), 4.2V, 0.02C(98mA) cutoff @ RT
- Discharge : 1C(4,900mA), 2.5V cutoff @ RT
3.3 Charging Voltage 4.2V
3.4 Nominal Voltage 3.63V
3.5 Charging Method CC-CV (constant voltage with limited current)
3.6 Charging Current Standard charge : 2,450mA
3.7 Charging Time Standard charge : 4hours
3.8 Max. Charge Current 4,900mA (not for cycle life)
3.9 Max. Discharge Current
9,800mA (for continuous discharge)
14,700mA (not for continuous discharge)
3.10 Discharge Cut-off Voltage 2.5V
3.11 Cycle life(1)
Capacity ≥ 3,802 mAh @ after 500cycles
(80% of the Rated Discharge Capacity @ RT)
- Charge : 0.5C(2,450mA), 4.2V, CCCV 0.05C(245mA) cut-off @ RT
- Discharge: 1C(4,900mA), 2.5V cut-off @ RT
3.12 Recovery characteristics
Capacity recovery (after the storage) ≥ 4,410mAh
(90% of the Standard discharge capacity @ RT)
- Charge : 0.5C(2,450mA), 4.2V, 0.02C(98mA) cutoff @ RT
- Storage : 20 days @ 60’C
- Discharge : 0.2C(980mA) 2.50V cut-off @ RT
3.13 Cell Weight 71.0g max
3.14 Cell Dimension
Cell height : Max.70.85mm
Top Diameter : Φ Max.21.50mm