Key Features
- 4200mAh Capacity: Provides long-lasting power for devices requiring extended runtime.
- 45A Max Continuous Discharge: Delivers consistent high current output for demanding applications.
- NMC Cathode Chemistry: Uses LiNiMnCoO2 for enhanced energy density and thermal reliability.
- Low Internal Resistance: ≤8mΩ for efficient energy transfer with minimal heat buildup.
- Rechargeable and Unprotected: Offers flexibility for builders integrating custom BMS solutions.
The BTCAP 42P 21700 is engineered for power-hungry systems, offering high discharge rates, superior NMC chemistry, and a reliable 4200mAh capacity. It's an ideal choice for e-mobility, DIY battery packs, power tools, and demanding electronics. This cell delivers stable output and extended cycle life, making it a cost-effective option for performance-focused builds.
Applications/Uses
- Power Tools: Ideal for high-drain tools requiring rapid discharge without performance loss.
- Battery Packs: Versatile for custom battery banks and energy storage setups.
- Electric Toys: Keeps RC cars, drones, and other devices powered longer.
- Consumer Electronics: Great fit for portable devices requiring large bursts of power.
- Prototype Builds: Popular among makers and engineers building high-output systems.
SPECIFICATIONS
| Manufacturer: | BTCAP |
| Model: | 42P |
| Size: | 21700 |
| Positive Terminal: | Flat Top |
| Nominal Capacity: | 4200mAh |
| Continuous Discharge Rating: | 45A |
| Nominal Voltage: | 3.6V |
| Maximum Voltage: | 4.2V |
| Discharge Cut-Off Voltage: | 2.5V |
| Protected: | No, Unprotected |
| Rechargeable: | Yes |
| Approx. Dimensions: | 21.6mm x 70.5mm |
| Approx. Weight: | 68g |
⚠ Important Safety Warnings
Improper handling or misuse of this lithium-ion battery can result in FIRE, EXPLOSION, or THERMAL RUNAWAY, causing personal injury, property damage, or death. Users must read and follow all safety guidelines before purchase and use. Click here to review the full safety guidelines.
- Critical Warning: Never carry loose batteries in your pocket, purse, or bag. Loose batteries can come into contact with metal objects like keys or coins, causing a short circuit, which may result in severe burns, fire, or explosion. Always store or transport batteries in a protective case.
- Intended Use: This battery is designed for integration into protected battery packs with a Battery Management System (BMS) or Protection Circuit Board (PCB). It is not intended for standalone use or for e-cigarettes, vaporizers, or similar devices.
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Thermal Runaway: A chain reaction where heat from a failing battery
causes further overheating, potentially leading to fire or explosion.
- Causes: Overcharging, short circuits, physical damage, or exposure to high temperatures.
- Prevention: Use a smart charger, avoid damage, and store batteries in a cool, dry place.
- Storage & Transport: Always store batteries in protective cases to prevent accidental contact with metal objects. Never store loose batteries in pockets, purses, bags, or near conductive materials.
- Inspection: Do not use if the PVC wrapper, terminal insulator, or casing is damaged, dented, leaking, or bulging. Continued use could result in failure, fire, or explosion.
- Charging: Use a smart charger specifically designed for lithium-ion batteries and ensure the charger's voltage matches the battery's specifications. Never overcharge, over-discharge, or leave unattended while charging.
-
Prohibited Activities:
- Do not expose the battery to extreme heat, fire, or liquids.
- Do not short circuit, puncture, crush, or modify the battery.
- Do not charge or discharge beyond the manufacturer’s voltage range.
- Do not dispose of in regular trash—always recycle at approved facilities.
- Emergency Response: If the battery overheats, emits smoke, or swells, move it to a non-flammable surface (e.g., sand or concrete) and stop use immediately. In case of fire, use a Class D fire extinguisher or sand. Do not use water.
Disclaimer
18650Battery.com is not responsible for any damages, injuries, or claims arising from improper use, handling, or failure to follow these safety guidelines. Lithium-ion batteries require strict adherence to all safety protocols. It is the reseller's responsibility to ensure all safety warnings and product guidelines are effectively communicated to customers. Users and resellers assume full responsibility for the safe handling, usage, and distribution of this product.