Samsung 40T 21700 Battery Cell 3.7V 4000mAh Lithium Ion for Flashlight E-bike
Summary of Samsung 40T 21700 Battery
The Samsung 40T 21700 4000mAh Lithium-Ion Battery is a high-energy-density power cell designed for applications that demand both long runtime and high discharge current. With its 4000mAh large capacity, low internal resistance, and the ability to deliver up to 35A continuous discharge, this original Samsung battery is trusted for use in flashlights, e-bikes, power tools, and other high-drain devices. Consistency, safety, and superior performance make it the perfect choice for both individual users and custom battery pack manufacturers.
Samsung 21700 40T Battery Specification
Model: 21700 Samsung 40T
Rated Capacity: 4000mAh
Minimum Capacity: 3900mAh
Energy: 14.4Wh
Energy Density: 211.8Wh/kg
Rated voltage: 3.6V
Discharge Cut-off Voltage: 2.5V
Charge Cut-off Voltage: 4.2V
Cycle Life: More than 250 cycles
Dimensions: Φ21*70mm
Weight: 68g
Internal Resistance: Less than 15mΩ
Standard Discharge Current: 1C (4A)
Standard Charge Current: 0.5C (2A)
Max Continuous Discharge Rate: 35A, No temperature limit
Max Continuous Discharge Rate:: 10C (40A), Temperature limit 80°C
Charging Temperature: 0 to 45℃;
Discharge Temperature: -20 to 60℃
Storage Temperature:
- -20℃~25℃: 12 months
- -20℃~45℃: 3 months
- -20℃~60 ℃: 1 month
Key Features of 18650 Panasonic 3400mAh NCR18650B Flat Top
High Energy Density – Up to 211.8Wh/kg
Samsung 40T offers industry-leading energy density, packing more power into a compact 21700 cell. This allows devices to run longer without increasing size or weight, making it ideal for portable electronics, flashlights, and mobility solutions.
Genuine Samsung Quality & Consistency
As an original Samsung-manufactured cell, the 40T guarantees premium quality, excellent batch consistency, and safe operation. Its stable chemistry and low internal resistance reduce energy loss and heat generation, improving overall efficiency and extending service life.
Large 4000mAh Capacity for Extended Runtime
With 4000mAh capacity, the Samsung 40T provides long-lasting power, reducing the frequency of recharges. It’s a perfect match for devices where extended operation and reliability are critical.
High Discharge Current Capability
One of the standout features of the Samsung 21700 40T is its ability to deliver:
35A continuous discharge current without temperature restrictions
40A discharge current with 80°C temperature cutoff
Makes it perfect for high-drain devices such as:
E-bikes & electric scooters 🚴
Power tools 🛠️
High-performance flashlights 🔦
Hobby drones & RC devices ✈️
Long Cycle Life
Engineered for endurance, the 40T retains over 60% of its original capacity even after 250 full charge-discharge cycles, ensuring long service life and dependable performance over time.
🛠️ Flexible Custom Battery Pack Solutions
We provide custom battery pack assembly using the Samsung 40T, tailored to your project requirements. Options include:
📏 Custom dimensions, voltage, and capacity
🏷️ OEM services: laser marking, labels, shrink wrap, and packaging
🔌 Connector and plug options
This makes it an excellent choice for manufacturers and DIY projects requiring reliable, high-current lithium battery solutions.
❓ FAQ
Q1: Can the Samsung 40T be used in e-bikes?
Yes, it’s highly suitable due to its high discharge rate and long runtime, making it perfect for e-bikes and scooters.
Q2: What makes the 40T different from other 21700 cells?
It combines large 4000mAh capacity with very high 35A continuous discharge, a balance few 21700 cells achieve.
Q3: Can I request custom battery packs with Samsung 40T cells?
Absolutely. Cestpower support OEM customization including voltage, capacity, connectors, labels, and casing.
Q4: Is it safe for high-current applications?
Q5: Why is Samsung 40t better battery for vaping
Related Battery
3.7V 21700 3000mAh Lithium Ion Battery Cell
