Description
Samsung 40T 21700 Battery – High-Performance Lithium-Ion Power Cell
Overview
The Samsung 40T 21700 Battery is a high-performance lithium-ion rechargeable power cell, designed for demanding applications requiring both high capacity and power output. With a 4000mAh capacity and an impressive continuous discharge rate of 35A, this battery is an ideal choice for high-drain devices that require efficient energy delivery and extended runtime.
Key Features
✅ High Capacity: 4000mAh ensures extended usage time before requiring a recharge.
✅ High Discharge Rate: 35A continuous discharge, perfect for power-hungry applications.
✅ Lithium-Ion Chemistry: Offers high efficiency, stability, and minimal voltage drop.
✅ Rechargeable & Durable: Supports multiple charge cycles with minimal performance loss.
✅ Larger 21700 Size: Provides higher capacity and better endurance compared to standard 18650 batteries.
Specifications
| Specification | Details |
|---|---|
| Brand | Samsung |
| Model | 40T |
| Battery Type | 21700 |
| Capacity | 4000mAh |
| Nominal Voltage | 3.6V |
| Full Charge Voltage | 4.2V |
| Discharge Cutoff Voltage | 2.5V |
| Continuous Discharge Rate (CDR) | 35A |
| Rechargeable | Yes |
| Protected | No (Unprotected cell – use with proper safety measures) |
| Cycle Life | ~300+ charge cycles |
| Diameter | 21.4mm |
| Length | 70.0mm |
| Weight | ~67g |
Applications
The Samsung 40T is widely used in high-drain electronic devices, including:
🔋 Electric Vehicles (EVs) & E-Bikes – Provides high power output and extended runtime.
🔋 Battery Packs – Frequently used in custom-built high-performance battery packs.
🔋 Power Tools – Suitable for cordless drills, saws, and heavy-duty equipment.
🔋 RC Vehicles & Drones – Delivers stable and long-lasting energy output.
🔋 Flashlights & Tactical Gear – Ideal for high-performance LED torches and professional gear.
🔋 Energy Storage Systems (ESS) – Used in power banks, solar storage, and backup energy systems.
Safety Guidelines & Warnings
⚠️ IMPORTANT SAFETY NOTICE ⚠️
Lithium-ion batteries require proper handling and knowledge to ensure safe usage. Failure to follow safety guidelines may result in fire, explosion, serious injury, or property damage.
General Safety Guidelines
✔ Only purchase and use if you fully understand lithium-ion battery safety.
✔ Always charge in or on a fire-resistant surface—never leave batteries charging unattended.
✔ Use only a compatible smart charger designed specifically for this type of battery.
✔ Store batteries in a protective case—never carry them loose in a pocket, bag, or purse.
✔ Keep away from metal objects (keys, coins, tools) to prevent short circuits.
✔ Use only within manufacturer-listed specifications and in protected battery packs.
✔ Resellers must provide these warnings to all customers.
🚫 Prohibited Uses & Handling
⛔ DO NOT use this battery in e-cigarettes, vaporizers, or similar devices.
⛔ DO NOT mix old and new, or used and unused batteries.
⛔ DO NOT short circuit, puncture, cut, crush, incinerate, or modify the battery.
⛔ DO NOT use if the battery wrapper is torn or damaged in any way.
⛔ DO NOT overcharge or over-discharge—this can lead to battery failure.
⛔ DO NOT expose the battery to liquids, extreme heat, or direct sunlight.
⛔ DO NOT solder directly—only use spot welding for battery pack assembly.
⚠ User Responsibility & Risk Acknowledgment
- The user assumes full responsibility for proper handling, charging, and storage.
- Misuse or mishandling may result in serious injury or damage.
- No guarantee of compatibility with any specific device is provided.
- Usage of this battery is at your own risk.
By purchasing and using the Samsung 40T 21700 Battery, you acknowledge and agree to follow all safety guidelines. Failure to comply may result in hazardous consequences. Prior knowledge of lithium-ion battery safety is required before purchase.
Stay safe and handle responsibly. 🔋