Tenpower INR21700-50XG High-Power 21700 Lithium-Ion Cell

5,000mAh capacity with serious high-current performance.

The Tenpower INR21700-50XG is a high-performance 21700 lithium-ion cell designed for battery systems that need both strong capacity and very high discharge capability.

Tenpower rates the 50XG at 5,000mAh nominal capacity, 40A continuous discharge without a temperature cutoff, and up to 90A continuous discharge when using a 75°C cell-temperature cutoff.

For short-duration high-power demands, Tenpower specifies a 140A pulse discharge for up to 3 seconds.

With internal impedance of ≤4mΩ, a maximum charge current of 15A, and a standard 21700 footprint, the 50XG is particularly well suited for high-performance e-bikes, electric motorcycles, robotics, drones, power tools, industrial equipment and custom high-current battery packs.

5,000mAh • 40A Continuous • 90A Temperature-Controlled Continuous • 140A 3-Second Pulse • 3.6V Nominal

Why Choose the Tenpower 50XG?

40A Continuous Without Thermal Cutoff

Unlike cells whose highest advertised current rating depends entirely on thermal cutoff conditions, Tenpower specifies the INR21700-50XG for 40A maximum continuous discharge without a temperature cutoff.

Up to 90A With Temperature Monitoring

For engineered systems with active temperature monitoring, Tenpower specifies up to 90A continuous discharge with a 75°C cell-temperature cutoff.

140A Pulse Capability

The manufacturer specifies a maximum pulse discharge of 140A for 3 seconds, making the 50XG suitable for applications with very high short-duration power demands.

5,000mAh Capacity

The 50XG maintains a full 5.0Ah nominal capacity, with Tenpower specifying 4,950mAh minimum capacity under standard test conditions.

Ultra-Low Internal Resistance

Tenpower specifies AC internal impedance of ≤4mΩ at 1kHz, 25±3°C and 30% SOC, helping minimize voltage sag and resistive losses during high-current operation.

Fast-Charge Capability

Standard charging is 2.5A, while maximum manufacturer-rated charging current is an impressive 15A.

Specifications

The dimensional, weight and temperature values above are directly specified in Tenpower V0.2.

Cycle Life

Tenpower specifies:

500 cycles with ≥60% of initial capacity remaining under its high-load cycle test.

Manufacturer cycle test conditions:

• Charge: 6A CC-CV to 4.20V
• Charge termination: 100mA
• Rest: 10 minutes
• Discharge: 40A
• Discharge termination: 2.50V or 75°C
• Rest: 45 minutes
• Ambient temperature: 25±3°C

After 500 cycles under those demanding conditions, the manufacturer specifies at least 60% capacity retention.

That is important because this is not a gentle 0.2C cycle-life test. Tenpower is cycling the cell at 40A discharge.

Best Applications

• High-performance e-bike battery packs
• Electric motorcycles
• Electric scooters
• Racing and performance battery systems
• Robotics
• UAVs and drones
• Power tools
• Cordless industrial equipment
• High-current custom lithium batteries
• OEM battery assemblies
• Light EV applications
• High-power mobility systems

Choosing Between Your High-Power Cells

This gives you a very good product ladder on ULS:

The 50XG should absolutely go in both your 21700 Cells and High Discharge Cells collections.

Important High-Current Rating

The 40A and 90A ratings should not be presented as the same thing.

Tenpower specifies:

40A continuous discharge WITHOUT temperature cutoff

and

90A continuous discharge WITH a 75°C temperature cutoff.

Therefore, a battery system operating above the 40A non-temperature-controlled rating requires appropriate thermal monitoring and pack engineering.

The finished battery pack may have a substantially lower current rating depending on the:

• BMS
• Busbars/interconnects
• Nickel or copper thickness
• Cell spacing
• Cooling
• Wiring
• Connectors
• Fuse system
• Enclosure
• Ambient temperature

The cell manufacturer specification explicitly distinguishes these two ratings.