Description
Defy the cold with the Reliance RS50, a revolutionary 21700 cell that combines tabless high-drain technology with extreme low-temperature capability down to -40℃. This 4-pack delivers a massive 5000mAh capacity, a continuous 70A discharge, and a 120A pulse rating, making it the ultimate all-weather power solution for drones, heavy-duty power tools, e-scooters, and cold-climate operations. The ultra-low internal resistance of approximately 5mΩ ensures minimal voltage sag and rapid power delivery even in sub-zero conditions where conventional batteries fail. The flat top design fits all standard 21700 devices and simplifies spot-welding for custom battery packs. When your mission cannot be stopped by winter, the Reliance RS50 is your unstoppable power source.
Key Features
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-40℃ Extreme Low Temperature Capability – Engineered with advanced low-temperature electrolyte, the RS50 discharges reliably at -40℃ where standard lithium cells completely fail. Perfect for polar expeditions, high-altitude drones, and winter outdoor work.
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70A Continuous / 120A Pulse Discharge – Delivers massive current for the most demanding applications. Handles power tool start-ups, e-scooter acceleration, and drone punch-outs with ease, even in freezing temperatures.
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5000mAh High Capacity – Industry-leading energy density for a high-drain low-temp cell. Enjoy extended runtime and flight time compared to standard 4000mAh cells.
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Tabless (All-Tab) Technology – Reduces internal resistance to ~5mΩ. Minimizes heat generation, maximizes power delivery, and maintains voltage stability under extreme loads.
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Flat Top Design – Universally compatible with 21700 spring-contact chargers, battery trays, and flashlights. Ideal for spot-welding nickel strips in custom battery packs.
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4-Pack Convenience – Perfect for building a cold-weather drone pack, equipping winter tools, or powering a compact e-scooter battery module.
Parameters
Applications
Recommended For
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Polar & High-Altitude Drones / FPV: Maintain stable flight power at -40℃ where standard LiPo and Li-ion packs fail. 5000mAh extends mission duration in cold weather surveillance and research.
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Cold-Climate Power Tools: Angle grinders, impact wrenches, and drills used in winter construction, mountain rescue, or arctic fieldwork operate without battery failure.
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Winter E-Scooters & Snow Vehicles: Overcome the severe range loss that conventional batteries suffer in freezing temperatures.
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Polar Research & Cold-Region Monitoring: Unattended weather stations, wildlife cameras, and scientific instruments that must operate reliably through extreme winters.
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Winter Search & Rescue Lights: High-output flashlights and searchlights that cannot afford battery failure during critical mountain rescue operations.
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Cold Storage & Cold Chain Logistics: Handheld terminals, scanners, and equipment used in -18℃ to -40℃ freezer environments.
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Competition Vaping & RC Racing (Cold Weather): Maintain peak power delivery during outdoor winter competitions and training sessions.
Not Recommended For
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Indoor Low-Power Devices (room temperature): The extreme low-temp capability is unnecessary and adds cost. Use a standard high-capacity cell like the Samsung 50G.
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Standard USB Power Banks: Severe performance overkill.
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18650-Only Devices: This is a 21700 cell and will not physically fit.
FAQ
Q: Can this battery really work at -40℃? How does the performance compare to room temperature?
A: Yes. The RS50 is specifically engineered with a low-temperature electrolyte that enables discharge at -40℃. At this extreme temperature, you can expect approximately 60-70% of the room temperature capacity and a slightly lower voltage under load. For best results at -40℃, we recommend limiting continuous current to around 40A to maximize runtime and minimize voltage sag.
Q: Can I charge this battery in freezing temperatures?
A: No. Never charge a lithium-ion battery below 0℃. The RS50 can discharge at -40℃, but charging must always be done above 0℃ (ideally 10-25℃). Charging below freezing causes irreversible lithium plating, permanently damaging the cell and creating a safety hazard. If the battery has been used in the cold, allow it to warm up to room temperature before charging.
Q: How does the RS50 compare to standard high-drain 21700 cells?
A: The RS50 matches or exceeds the performance of top-tier tabless cells like the EVE 40PL or Ampace JP40 in terms of current delivery (70A continuous, 120A pulse) and capacity (5000mAh), while adding the unique -40℃ low-temperature capability that no standard cell can match. It is essentially a premium all-weather upgrade.
Q: Is this battery suitable for my FPV drone?
A: Absolutely. For winter FPV flying or high-altitude missions, the RS50 is a game-changer. It provides the high burst current needed for punch-outs and acrobatics, the 5000mAh capacity for extended flight time, and reliable operation in freezing conditions that would ground standard packs.
Q: Do I need a special charger?
A: No special charger is required. Use any quality CC-CV lithium-ion charger compatible with 21700 cells. The critical rule is to always ensure the battery temperature is above 0℃ before initiating a charge cycle.
