Compact 43×63×74 mm design keeps weight low and fits tight frames.
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Longer Flight Time for FPV Cruising
Compared with traditional LiPo batteries, the iFlight Fullsend 6S 4000mAh Li-Ion battery delivers significantly longer cruising time for cinematic and long-range FPV flights.
The high-energy-density 21700 Li-Ion cells allow pilots to fly farther while maintaining stable voltage output during low-throttle cruising.
Check out our 4000mAh Battery, all FPV Battery Collection and the rest of our iFlightProducts!
High-Efficiency EVE 21700 Cells
Built with high-quality EVE INR21700-40PL cells, the Fullsend battery provides:
Stable voltage delivery, lower voltage sag, High energy density, Better cruising efficiency, Reliable long-range performance. Compared with low-quality Li-Ion packs, EVE cells maintain more consistent power output during extended flights.
Smooth Cruising Power with 17.5C Output
The 17.5C discharge rate is optimized for efficient cruising and cinematic flying rather than aggressive freestyle.
This means: Stable cruising, Lower heat generation, Better battery efficiency, Longer flight duration.
Compact Design for Better Efficiency
With a compact 43×63×74mm form factor and only 430g weight, the Fullsend battery minimizes unnecessary payload while maximizing flight endurance.
The XT60H connector ensures a secure and reliable connection for long-range flights.
Specifications
● Capacity: 4000mAh
● Voltage: 22.2V
● Cell Type: EVE INR21700-40PL
● Battery Capacity: 88.8Wh
● Cell combination: 6S1P
● Size: 43*63*74mm
● Weight: 430g
● Discharge rate: 17.5C
● Battery type: Lithium-ion
● Connector: XT60H
● Discharge wire plug and length: XT60H-F(AMASS)-130(±8）mm
● Charging cable plug and length: JST-XH2.54-7P-45mm
● Max Voltage (Fully Charged): 25.2V (4.2V per cell)
Disclaimer and Safety Guidelines
Safety Reminder: Supervise the battery charging process at all times and ensure to keep away from flammable materials. Improper charging may cause fire, and disassembling, damaging, using damaged batteries, or exposure to fire may lead to explosion. To ensure safety, please regularly check the battery's condition and stop using it immediately if any abnormalities are found.
Disclaimer: Users must carefully read and follow the safety instructions before using this product; any consequences resulting from improper use are the user's responsibility.
About Iflight Fullsend 6S 4000mAh Li-Ion Battery
The iFlight FULLSEND EVE INR21700-40PL 6S 4000mAh Li-Ion battery is designed for FPV pilots who demand longer flight times without sacrificing performance or reliability. High-quality EVE INR21700-40PL cells provide stable power output with minimal voltage sag, ensuring your drone maintains performance under heavy load. The 17.5C discharge rate delivers consistent power for demanding long-range flights, making it compatible with quads like Chimera7 and Nazgul Evoque F6. Its compact size and lightweight design reduce stress on your frame, while the XT60H connector provides a secure, plug-and-play experience. Whether you’re racing, filming, or exploring, this battery keeps you in the air longer and with more confidence.
Changelog
March 3, 2025: The chip is changed from EVE INR21700-40P to EVEINR21700-40PL, the discharge rate is changed from 10C to 17.5C, and the cable length is changed. Both versions are shipped randomly.
Recommendtions
Reviews
L********e
Verified
Perfect for cruising. Getting nearly 25 minutes on my 7-inch build. The battery was well packed and arrived with storage voltage. Shipping took a bit longer to AU, but the tracking was accurate.
Specification：Fullsend 6S 4000mAh Li-Ion Battery
O************t
Verified
Insane flight time for cruising. Not made for racing or heavy punch-outs, but perfect for long range cinematic flights.
Specification：Fullsend 6S 4000mAh Li-Ion Battery
E**********n
Verified
Cruising for 20+ minutes with this pack on my 7-inch. It’s heavy but the capacity is real. Shipping was a bit slow due to battery rules but the team kept me updated.
Specification：Fullsend 6S 4000mAh Li-Ion Battery
R*********r
Verified
arrived fast and packed really well. plugged in and works out of the box. not super punchy but that’s expected for li-ion. great for long range.
Specification：Fullsend 6S 4000mAh Li-Ion Battery
Additional reviews after 8
days
been using for a week now, no issues so far. holds voltage pretty well during cruise.
J*****X
Verified
Arrived faster than I expected, packaging was solid and nothing damaged. Using it on my long range build and honestly the runtime is really stable, voltage drop is lower than my old pack. Mepsking support also answered my question about discharge rate pretty quick. Good experience overall.
Specification：Fullsend 6S 4000mAh Li-Ion Battery
E*********r
Verified
Perfect for long-range cruising. The discharge is not super aggressive but very stable. I use it on my 7-inch build and it gives excellent flight time without voltage sag issues.
Specification：Fullsend 6S 4000mAh Li-Ion Battery
C**********r
Verified
worth the price. got it mainly for long range and it does the job. flight feels smooth and efficient.
Specification：Fullsend 6S 4000mAh Li-Ion Battery
L******r
Verified
Just got this pack and first impression is really good. Looks clean and well built, wires feel solid and XT60 fits tight. Packaging was neat, no damage at all.
Specification：Fullsend 6S 4000mAh Li-Ion Battery
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FAQFeel free to ask us any questions
Q: What drones are compatible with the iFlight FULLSEND EVE 6S 4000mAh battery?
A: The iFlight FULLSEND EVE 6S 4000mAh Li-Ion battery works seamlessly with long-range FPV quads such as Chimera7, Nazgul Evoque F6, and other 6S1P frame drones requiring XT60H connections.
Q2: What is the discharge rate and flight performance of the iFlight FULLSEND EVE battery?
A: With a 17.5C discharge rate and high-quality INR21700-40PL cells, this battery delivers stable power with minimal voltage sag, ensuring long, reliable flights for FPV and long-range drone applications.
Q: How long can a 6S 4000mAh Li-Ion battery last in flight?
A: Flight time typically ranges from 15 to 30 minutes depending on the drone setup, efficiency, and flying style.
Q: What does 17.5C discharge mean for this Li-Ion battery?
A: A 17.5C rating means moderate discharge capability, suitable for cruising and smooth flying, but not for aggressive freestyle or racing.
Q: What FPV drones are compatible with the Fullsend 6S Li-Ion battery?
A: It is ideal for long-range 5-inch, 6-inch, and 7-inch FPV drones designed for efficiency and endurance flights.
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