For battery cells, review the product description for real-world current recommendations, testing notes, and application guidance. Manufacturer maximum ratings should be treated as limits, not the best target for long-term pack health.
Description
EVE 40P 21700 Cell | 4000mAh | High-Power Lithium-Ion Battery
The EVE 40P 21700 4000mAh is a high-power lithium-ion cell designed for applications that require strong current delivery, solid energy density, and dependable performance under load.
With a 4000mAh nominal capacity (3950mAh minimum), 3.6V nominal voltage, and up to 50A continuous discharge with temperature cut-off, this cell is well suited for power tools, garden tools, drills, lawn mowers, vacuum systems, and custom high-drain battery packs.
EVE positions the 40P as a full-rate 21700 cylindrical NCM cell intended for demanding equipment that benefits from strong discharge capability and reliable pack-level performance. It is best used in properly engineered battery packs with suitable BMS or PCB protection and temperature monitoring.
Specifications
- Model: EVE INR21700/40P
- Size: 21700
- Nominal Capacity: 4000mAh
- Minimum Capacity: 3950mAh
- Nominal Voltage: 3.6V
- Max Voltage: 4.2V
- Min Discharge Voltage: 2.5V
- Max Continuous Discharge: 50A (12.5C) with temperature cut-off; recommended temperature cut-off: 75°C, maximum temperature: 80°C
- Standard Charge Current: 2.0A (0.5C)
- Max Charge Current: 6.0A (1.5C)
- Standard Discharge: 0.8A (0.2C), 2.50V cut-off
- Chemistry: NCM / Li-ion
- Protected: No
- Rechargeable: Yes
- Initial Impedance: ≤12mΩ
- Approx. Weight: 70.0g max
- Dimensions: 21.15 ± 0.10mm diameter × 70.15 ± 0.15mm height
- Operating Temperature: Ambient charge: 0°C to 45°C; ambient discharge: -20°C to 60°C. Cell surface charge: 0°C to 60°C (recommended recharge release below 45°C); cell surface discharge: -20°C to 80°C (recommended re-discharge release below 60°C)
- Storage Condition: -20°C to 60°C within 1 month; -20°C to 45°C within 3 months; -20°C to 25°C within 1 year (at shipping SOC)
- Cycle Life: Capacity after 300 cycles: ≥60% of initial capacity (6.0A charge / 30A discharge to 2.50V or 75°C cut-off)
- Datasheet: Datasheet
Applications
- Power Tools
- Garden Tools
- Drills
- Lawn Mowers
- Vacuum Systems
DIY500AMP.COM Design | High-Power, Tool-Ready Performance
⚠️ Safety Warning for Lithium-Ion Battery Usage
Customers should understand proper lithium-ion battery handling before use. These cells can present fire, burn, or explosion hazards if short-circuited, overcharged, physically damaged, overheated, punctured, or used outside manufacturer specifications. Always charge on a fire-resistant surface and never leave charging batteries unattended.
By purchasing or using this battery, the user assumes responsibility for correct handling, pack integration, charging, temperature management, and protection. This cell is best used in a properly designed battery pack with appropriate BMS or PCB protection. Only use chargers and charging methods designed for this battery type, and never mix old and new cells in the same pack.
Important Usage Guidelines
- Not for use in e-cigarettes or similar devices
- Use in a properly protected pack
- Spot weld only. Do not solder directly
- Monitor temperature under high load
- Inspect wrap and insulator ring before use
- Follow manufacturer specifications strictly
Orders ship from Florida when inventory is available. Lithium-ion cells require proper handling, protected packs, correct chargers, and safe storage. Do not solder directly to battery terminals.
Payment and Security
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Wow, these cells are great!
I purchased some of these tabless cells to try on my 1S 3" HD Toothpick drone build, and, albeit a bit heavy for 1S, it flies pretty well. Not a freestyle monster, but an endurance beast with decent send. These cells shrug off the demands of a BETAFPV Matrix HD AIO flight controller/12A ESC and some 1202.5 11000KV motors. I'm getting 15+ minutes of speedy flight time from a single cell trying not to go below 3.2V, and about 20+ minutes cruising. Love these cells and will definitely buy more when time comes, only from DIY500AMP, who are terrific!
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