Description
Samsung 40T 21700 4000mAh Battery – High-Drain Power with Maximum Efficiency
Why Choose the Samsung 40T?
✔️ 4000mAh High-Capacity – Provides extended power for demanding applications✔️ 35A Continuous Discharge – Reliable high-current output for performance devices
✔️ Quick Charging Capability – Supports fast recharging for minimal downtime
✔️ Durable Cycle Life – Engineered for long-term reliability and efficiency
✔️ Ideal for High-Drain Devices – Perfect for EVs, power tools, and industrial applications
The Samsung 40T 21700 battery is designed for high-performance applications requiring powerful, sustained energy output. With a 4000mAh capacity and a 35A continuous discharge rating, this battery is well-suited for electric vehicles, battery packs, power tools, and industrial applications.
Built using Samsung SDI’s advanced lithium-ion technology, the 40T delivers a balance of high current, efficient power delivery, and long-term stability. Its fast-charging capabilities further enhance usability, making it a trusted choice for professionals and enthusiasts alike.
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
🔹 Use a dedicated lithium-ion charger for optimal charge cycles🔹 Avoid exceeding the 35A discharge limit for best longevity
🔹 Store at partial charge when not in use for long periods
⭐ Why Buy From IMR Batteries?
🔹 100% authentic cells🔹 Over a decade of experience in the battery industry
🔹 One of the largest inventories of high-performance lithium-ion cells
🔹 Fast and secure shipping with real-time tracking
🔹 Trusted supplier serving professionals and enthusiasts alike
⚠ 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 or box.
- 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 use in devices such as e-cigarettes or vaporizers.
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What is Thermal Runaway?
- A dangerous chain reaction where heat generated by a failing battery causes it to overheat further, potentially leading to fire or explosion.
- Causes: Overcharging, short circuits, physical damage, or exposure to high temperatures.
- Prevention: Use a smart charger, avoid physical damage, and store batteries in a cool, dry place.
- Storage & Transport: Always store batteries in protective cases or boxes 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. These are signs of internal damage or instability, and continued use could result in failure, fire, or explosion.
- Charging: Use a smart charger designed specifically for lithium-ion batteries and ensure that the charger's voltage matches the battery's specifications. Never overcharge, over-discharge, or leave unattended while charging.
- Prohibited Activities: Do not short circuit, modify, puncture, crush, expose to liquids, or solder directly onto the battery (spot weld only).
- Emergency Response: If the battery shows signs of thermal runaway (e.g., smoke, swelling, or heat), immediately stop use and move it to a non-flammable surface (e.g., concrete or sand). For fires, use a Class D fire extinguisher or sand—never use water.
Disclaimer
IMR Batteries 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 their customers. Users and resellers assume full responsibility for the safe handling, usage, and distribution of this product.