The THOR-21700 is a 3.7V 5000mAh 21700 cylindrical lithium-ion cell, 21.0 × 70.0 mm (Ø × H). The 21700 format is the industry standard for building series and parallel battery packs, and is widely used in e-mobility, energy storage, robotic vacuums, high-drain power tools, and portable power stations.

THOR Power builds the THOR-21700 into custom series/parallel packs — matched cells, BMS protection, nickel busbars, housing and the connector of your choice. Bare cells and welded modules are also available. Tell us your target voltage, runtime and discharge current, and our engineers will size the pack for you.

• Proven 3.7 V nominal cylindrical cells from tier-1 suppliers
• Long cycle life — typically several hundred to 1,000+ cycles
• Built-in protection: overcharge, over-discharge, short-circuit
• Custom series/parallel configuration, connector & BMS
• UN38.3 / MSDS ready; CE, KC, ROHS on request

Why Choose THOR Power

A vertically integrated lithium battery manufacturer (Dengzhou Xinju New Energy) with the scale and engineering depth to deliver custom LiPo cells reliably at volume.

3 factories, 800+ staff

Source-manufacturer scale — not a trading company.

200+ engineers

R&D led by a chief battery scientist for rapid custom design.

60,000 pouch cells / day

Mostly exported overseas, across the US, Europe, Japan & Korea, SE Asia, Latin America and Africa.

Full certification

UN38.3, MSDS, CE, KC, UL, CB, PSE, RoHS.

Global export

US, Europe, Japan & Korea, SE Asia, Latin America, Africa.

End-to-end quality control

From raw material to finished cell.

Factory Photos

Automation Equipment

Production Line

Testing Equipment

Warehouse & Certifications