Reliance 21700 batteries are tabless, high-drain lithium-ion cells built for serious current delivery in demanding pack builds.
The Reliance line — including cells like the RS40 (4000mAh) and RS50 (5000mAh), both 70A-class — pairs strong continuous output with the capacity and energy headroom of the 21700 format. The tabless construction is the key: instead of routing current through a single welded tab, tabless cells connect along the full electrode edge, lowering internal resistance for flatter voltage under load, cooler operation, and stronger sustained output.
That combination of high capacity and high current makes Reliance cells a strong fit for drones, e-mobility, and other high-output builds where both runtime and power matter.
Key features
Tabless construction for low resistance and strong sustained output
High-drain cells with 70A-class current capability
High-capacity options including RS40 and RS50
21700 format — more capacity and energy than 18650
