The iFlight FULLSEND 4000mAh 6S1P Li-Ion Battery is built for pilots who value extended airtime, smooth cruising, and efficient performance. Designed around EVE INR21700-40PL cells, it is a solid choice for long-range quads like the Chimera7, Nazgul Evoque F6 or F5, BOB57, BOB46, CineLR7, CineFlow5 and other endurance-focused builds.

This pack strikes a balance between lightweight construction and dependable power delivery, making it ideal for 5" to 7" long-range platforms.
⚠️ Note: This battery is not intended for aggressive freestyle or racing. For high-throttle performance, a LiPo pack is recommended.

Highlights

Extended Flight Times: 4000mAh capacity for smooth endurance flights
6S1P Configuration: Compact, travel-friendly format
Premium Cells: EVE INR21700-40PL – optimized for long-range use
Lightweight Build: Only 430g – perfect for efficiency-focused rigs
Safe & Reliable: XT60H main connector + JST-XH balance plug
Estimated Flight Time: In typical long-range setups (e.g., 6 to 7 inch quads), this pack can provide around 15 minutes or more of flight time during efficient cruising. Actual flight duration may vary depending on wind, altitude, flight speed, payload (such as an action camera), as well as the condition of your propellers and motors.

Technical Specifications

Cell: EVE INR21700-40PL
Nominal Voltage: 3.6V
Nominal Capacity: 4000mAh
Max Charge Voltage: 4.2V per cell
Cut-off Voltage: 2.5V per cell (2.9–3.1V recommended end-flight)
Continuous Discharge (per cell): 30–35A
Pulse Discharge (per cell, short <10s): ~40A
Operating Temp (Discharge): –20°C to +75°C
Operating Temp (Charge): 0°C to +50°C

Pack Overview
Configuration: 6S1P (22.2V nominal)
Capacity: 4000mAh / 88.8Wh
Practical Continuous Current: ~20–25A (safe for long-range cruising)
Burst Current (<10s): ~35–40A
Dimensions: 43 × 64 × 77mm
Weight: 430g
Connector: XT60H (130mm discharge lead) + JST-XH balance lead (45mm)
Optimal Ambient Operating Range: 15°C to 35°C for performance & longevity

Package Includes

1× iFlight FULLSEND 4000mAh 6S1P Li-Ion Battery – XT60H

Charging Guidelines

Always use a Li-Ion compatible balance charger — never attempt to charge with a non-compatible charger.
Charge at 1C or lower (≤4A for this 4000mAh pack) for optimal safety and cycle life.
Do not exceed 2C charge rate under any circumstance.
Never charge unattended or near flammable materials.
Do not charge below 0°C or above 50°C. Charging outside of this range may cause lithium plating, overheating, or permanent cell damage.
Stop charging immediately if the battery becomes hot, swollen, or shows abnormal behavior.

Storage Guidelines

Storage Voltage: Keep at 3.7–3.85V per cell (≈40–60% charge). Do not store fully charged or fully discharged.
Avoid Drain: Never leave connected to a charger, quad, or device that could slowly discharge it.
Temperature Control: Store in a cool, dry place between 15°C and 25°C. Avoid high heat, direct sunlight, and freezing conditions.
Fire Safety: Always store batteries in a fireproof bag, battery storage bag, or fireproof container. We offer a range of approved LiPo-safe storage solutions in our shop.
Inspection: Check periodically during long storage. If swelling, leakage, or abnormal odor is detected, stop using immediately and dispose of safely.

Disclaimer and Safety Guidelines

Safety Reminder: Always supervise the charging process and keep the battery away from flammable materials. Improper charging, over-charging, or over-discharging can cause overheating, fire, or explosion. Short-circuiting, puncturing, disassembling, or exposing the battery to heat sources or fire may also result in serious injury or damage. Only use compatible chargers designed for Li-Ion batteries. Regularly inspect the battery for damage, swelling, or irregular behavior, and discontinue use immediately if any abnormalities are observed.

Disclaimer: By purchasing and using this product, the user agrees to operate it in accordance with all provided safety instructions. The manufacturer and seller assume no responsibility for damage, injury, or loss caused by improper charging, discharging, storage, handling, or use of this battery. The user accepts full responsibility for all risks associated with its use.