Reliance 21700 Batteries

Reliance 21700 cells are tabless, high-drain lithium-ion cells built to push real current in demanding pack builds.

The lineup — like the RS40 (4000mAh) and RS50 (5000mAh), both 70A-class — combines strong output with high capacity in the 21700 format. Their tabless design lowers internal resistance by connecting across the full electrode edge rather than through one tab, which means flatter voltage under load, less heat, and output that holds up through the discharge.

For builders working on drones, e-mobility, or other high-output projects, that mix of capacity and current makes Reliance a capable, high-performance choice in the 21700 format.

Why builders choose them

• Tabless design — low resistance, flat discharge, cooler under load
• 70A-class high-drain current capability
• High-capacity RS40 and RS50 options
• 21700 capacity and energy advantage over 18650

Built for

• High-output drone and UAV packs
• E-bike, e-scooter, and light EV builds
• High-drain RC and performance applications
• Custom 21700 pack assembly where current matters