The numbers represent the physical dimensions of the cylindrical cell: 18mm in diameter and 65mm in length. The “0” at the end signifies that it is a cylindrical cell.

It’s a trade-off in battery design. High-capacity cells (e.g., 3500mAh) are designed to store the most energy and are ideal for long-runtime applications like laptops. High-discharge cells (e.g., a 2000mAh, 10C cell) are designed to deliver a large amount of power quickly and are perfect for high-torque applications like power tools.

This describes the pack’s internal configuration. The number before “S” indicates how many cells are in Series (which multiplies the voltage; e.g., 3S is 3 x 3.7V = 11.1V). The number before “P” indicates how many cells are in Parallel (which multiplies the capacity; e.g., 2P is 2 x 2600mAh = 5200mAh). A 3S1P pack has 3 cells in series; a 2S2P pack has 2 cells in series and 2 in parallel, for a total of 4 cells.

A BMS is the brain of a multi-cell pack. It’s critical for safety as it protects against over-charge, over-discharge, short circuits, and overheating. Most importantly, it performs cell balancing, which ensures all cells in the pack are at an equal state of charge, drastically increasing the pack’s performance and lifespan.

Before we build a pack, we use automated sorters to test and group individual 18650 cells that have nearly identical capacity and internal resistance. Building a pack with these “matched” cells ensures that the pack charges and discharges evenly, which is crucial for safety, performance, and achieving a long cycle life.

The MOQ for a new custom-engineered pack depends on the complexity of the BMS and housing. It typically starts from 1000 units for professional applications and can be higher for more complex designs.

Yes. While the individual cells are cylindrical, we can arrange them in various configurations (flat, square, L-shaped, etc.) and design a custom plastic enclosure with your branding, mounting features, and connectors.

The individual cells we sell are typically unprotected, intended for integration into a custom battery pack that will have its own external BMS. The complete battery packs we manufacture are always protected by an integrated, intelligent BMS.

Yes. While less common than the standard 3.7V NMC/NCA chemistry, 3.2V LiFePO4 (LFP) 18650 cells are available. We can build custom packs with these cells for applications that require extreme cycle life (3000+ cycles) and the highest level of safety.

Please provide your application’s required voltage (V), target capacity (Ah or Wh) or runtime, the continuous and peak discharge current (Amps), the maximum dimensional constraints for the pack, and your estimated annual volume.