The Samsung 40T is a well-balanced 21700 cell that offers both high capacity and solid discharge performance. With 4000 mAh capacity and up to 25 A continuous discharge, it is an excellent choice for users who want long runtime combined with stable power output.
This is an INR Li-ion cell without an internal protection circuit (unprotected). This means all safety functions must be managed by the device or charger. The nominal voltage is 3.6 V, maximum charge voltage 4.2 V, and the cut-off voltage is about 2.5 V. Dimensions are approximately 21.1 × 70.2 mm and the weight is around 68 g.
Contents
- 1 × Samsung 40T 21700 battery
Features
- Type: INR / Li-ion 21700
- Capacity: 4000 mAh
- Continuous discharge: 25 A
- Maximum short pulse discharge: up to approx. 35 A
- Nominal voltage: 3.6 V
- Full charge voltage: 4.2 V
- Cut-off voltage: approx. 2.5 V
- Dimensions: ~21.1 × 70.2 mm
- Weight: ~68 g
- Protection: No internal protection circuit (unprotected – requires device/charger with safety features)
- Manufacturer: Samsung SDI
Frequently Asked Questions
How do I charge the Samsung 40T?
Use a quality Li-ion charger with a CC/CV profile charging up to 4.2 V and monitoring cells individually.
Is this battery safe for mods and e-cigarettes?
Yes, if used within its specifications and only in devices with proper safety features.
How long does the battery last between charges?
With 4000 mAh capacity, it offers longer runtime than high-drain cells like the 30T (3000 mAh), but with slightly lower maximum discharge.
What is the difference between the Samsung 40T and 30T?
The 40T has higher capacity (4000 mAh) but lower discharge capability (25 A) than the 30T, making it more focused on endurance.
About Samsung SDI
Samsung SDI is a leading manufacturer of lithium-ion batteries, known for cells that combine quality, safety and reliability. Their products are used worldwide in both consumer electronics and industrial applications.
