Description
Samsung 40T 21700 4000mAh Battery – Reliable High-Drain Power for Advanced Applications
Why Choose the Samsung 40T?
✔️ 4000mAh Capacity – Extended energy supply for high-demand devices✔️ 35A Continuous Discharge – Stable high-output performance
✔️ Fast Charging Support – Reduces downtime with quick recharge capabilities
✔️ Robust Cycle Life – Retains efficiency over hundreds of cycles
✔️ Ideal for Power Tools & Battery Packs – Designed for sustained high-drain applications
The Samsung 40T 21700 lithium-ion battery is built for reliable high-discharge performance, making it an excellent option for electric vehicles, industrial power tools, and high-drain battery packs. With a 4000mAh capacity and 35A continuous discharge rating, it delivers consistent power output while maintaining efficiency over time.
Samsung SDI’s advanced cell chemistry ensures thermal stability, high-current capability, and excellent cycle life. Whether used in professional or DIY applications, the 40T is a dependable power source built for high-performance needs.
Specifications
| Brand | Samsung SDI |
| Model | 40T (INR21700-40T) |
| Cell Size | 21700 |
| Nominal Capacity | 4000mAh |
| Continuous Discharge Rating | 35A |
| Nominal Voltage | 3.6V |
| Full Charge Voltage | 4.2V |
| Discharge Cutoff Voltage | 2.5V |
| Rechargeable | Yes |
| Protected | No (Unprotected – Requires external protection circuit) |
| Cycle Life | ~250 cycles |
| Diameter | 21.1 mm |
| Length | 70.4 mm |
| Weight | ~66.8 g |
💡 Pro Tips for Maximum Performance
🔹 Charge batteries before first use for optimal performance🔹 Keep away from extreme heat to extend lifespan
🔹 Ensure proper insulation when assembling battery packs
⭐ Why Buy From 18650Battery.com?
🔹 100% genuine batteries🔹 Over a decade of expertise in lithium-ion technology
🔹 Large inventory of high-drain lithium-ion cells
🔹 Fast order processing and nationwide shipping
🔹 Dedicated technical support for battery applications
⚠ 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.