Cylindrical Lithium Cells

Cylindrical cells remain the right answer whenever you need high discharge rates, standardised holders or a pack shape no prismatic cell can fill — and CMX Battery builds the pack around them, holder, strip, BMS and housing included.

Overview

CMX Battery supplies 18650, 21700, 26650 and 32700 cylindrical lithium cells in both power and energy grades. Cylindrical form factors handle high discharge currents and mechanical shock better than prismatic cells and drop into standard holders and spot-weld layouts, which is why they dominate power tools, e-bike, portable and specialty packs. We grade cells for your application, then design and weld the pack — holder, nickel strip, BMS and enclosure — so you receive a tested assembly, not loose cells.

Key specifications

Specification	Value	Why it matters
Sizes	18650 / 21700 / 26650 / 32700	Each size trades capacity against discharge rate and form factor.
Grades	Power (high C-rate) and energy (high capacity)	Pick the grade from the load profile: bursts vs runtime.
Chemistry	LiFePO4 or NMC per application	LFP for safety/cycle life; NMC where energy density or cold performance leads.
Typical capacity	18650 ≈2.5–3.5Ah; 21700 ≈4.0–5.0Ah	21700 packs more energy in a similar diameter.
Assembly	Spot-welded packs with BMS and enclosure	We build the pack, not just the cells.

Typical applications

Power tools and e-mobility: High C-rate cylindrical packs.
Portable power stations: 21700-based energy packs.
Medical and instrumentation: Small, shock-resistant banks.
OEM custom packs: Holder, strip, BMS and housing designed to spec.

How to specify & buying guide

Choose power vs energy grade from your peak C-rate — do not over-spec capacity at the cost of discharge ability.
Tell us the pack voltage and shape; we design holder, nickel strip and spot-weld layout, not just supply cells.
Specify the BMS topology (series/parallel, communication) so the pack arrives protected and balanced.
Require incoming-grade matching data for the cells we weld into your pack.

Engineering & manufacturing at CMX Battery

CMX Battery grades every LiFePO4 prismatic and cylindrical cell on capacity, internal resistance and self-discharge before it enters a pack. We ship matched batches with per-cell test data keyed to serial numbers, so your production line is not sorting cells on arrival. Bulk cells, welded modules and complete packs are all built under the same quality system.

Certifications & compliance

UN38.3 — Mandatory lithium battery transport test (altitude, thermal, vibration, shock, external short). Required for any cross-border shipment.
IEC62133
MSDS — Material safety data sheet for handling and shipping.
RoHS — Restriction of hazardous substances in the battery and BMS.
CE — EU declaration of conformity for the applicable directives.

Frequently asked questions

Do you build the pack or just sell cells?

Both. We supply loose graded cells and build complete packs with holder, nickel strip, BMS and enclosure.

Which chemistry do you recommend for portable?

LiFePO4 for safety and cycle life where energy density allows; NMC where weight or cold performance leads.

Can you match a specific C-rate?

Yes — tell us the continuous and peak current and we select the power or energy grade accordingly.

What documentation ships?

Cell test data plus pack assembly and BMS documentation, UN38.3 and MSDS.

Request a quote

Send us your voltage, capacity, dimensions, certification target and annual volume. Our engineering team returns a proposal within three working days. Start your RFQ or review our custom pack capabilities.