VAPCELL Samsung 21700 40T LI-ION Battery
Designed for the "Power-Hungry" mission profile, the Samsung 40T is a "balanced" cell that doesn't sacrifice discharge for capacity. While 18650 cells often struggle to maintain voltage under full throttle, the 21700 form factor allows for a larger internal surface area, resulting in significantly lower internal resistance (IR) and superior thermal management during high-current draw phases like take-off and punch-outs.
Key Technical Specifications:
Power Output Mastery: Rated for 35A continuous discharge, making it safe for 6S1P or 6S2P packs on drones that require high instantaneous thrust without the risk of thermal runaway.
Cell Architecture: The 21700 (21mm x 70mm) footprint offers roughly 50% more volume than an 18650, allowing for a 4000mAh energy density that extends mission range by 30-40% over standard LiPo builds.
Authenticity Guaranteed: Sourced through Vapcell, these cells undergo strict batch testing to ensure they meet the Samsung Grade-A specification, crucial for preventing cell imbalance in multi-cell UAV packs.
Durability for India: The 40T chemistry is robust enough to handle the thermal cycles of the Indian climate, maintaining a stable discharge curve even in ambient temperatures up to 45°C.
Application: Ideal for custom Sub-250g long-range builds (in 2S/3S) or heavy 7-inch "Mountain Surfers" (in 6S1P/6S2P) where reliability and power are non-negotiable.
Vapcell rewrap ensures authenticity and quality.
Flat top design suits various applications.
Rechargeable for economical, long-term performance.
Low internal resistance for maximum efficiency.
Superior quality for durable, safe operation.
Frequently Asked Questions (FAQ)
1. What makes the Samsung 40T ideal for FPV and UAV applications? The Samsung 40T is a "Goldilocks" cell for 21700 battery packs. It offers a massive 35A continuous discharge while maintaining a 4000mAh capacity. For FPV pilots, this means you get the flight time of a Li-Ion with the "punch" and low voltage sag usually only found in LiPo batteries.
2. Can I use the Samsung 40T for racing drones or just long-range UAVs? While 18650s are strictly for long-range cruising, the 40T's 35A rating allows it to handle the higher amp draws of 5-inch or 7-inch freestyle and cinematic drones. It is perfect for mid-range missions where you need both endurance and the ability to punch out of a dive.
3. What is the weight penalty when moving from 18650 to 21700 cells? A single Samsung 40T 21700 cell weighs approximately 70 grams, whereas a standard 18650 (like the VTC6) weighs about 48 grams. While a 4S or 6S pack will be heavier, the increased energy density and higher current handling often result in a more stable flight for larger UAVs.
4. What are the recommended charging parameters for the 40T? To maximize cycle life, a standard charge rate of 2.0A (0.5C) is recommended. In a hurry, they can be fast-charged at 4.0A (1C), provided your charger supports high-capacity 21700 cells. Always ensure your charger is set to the Li-Ion nominal voltage of 3.6V (4.2V termination).
5. How does the 40T compare to the Samsung 30T or Molicel P42A?
Vs. 30T: The 40T has more capacity (4000mAh vs 3000mAh) but slightly more voltage sag at extreme currents.
Vs. P42A: They are very similar, but the 40T is often preferred for its consistency in multi-cell packs for custom UAV long-range builds.
