14280 Lithium Battery 350mAh 3.7V | NCM14280-035 Cylindrical Li-ion Cell

14280 Lithium Battery — NCM14280-035 350mAh 3.7V Cylindrical Li-ion Cell

The 14280 lithium battery (model NCM14280-035) is a compact cylindrical li-ion cell measuring 14.1 mm in diameter and 27.7 mm in height, delivering 350 mAh at a nominal 3.7 V — about 1.295 Wh in a steel can smaller than a AA cell. It is rated for 2C continuous discharge, charged by standard CC-CV at 4.20 V, and shipped against a controlled specification with UN38.3, IEC 62133-2 and RoHS documentation. CMX Battery supplies it with per-lot capacity, IR and OCV test data, OEM branding, and a downloadable datasheet.

Table of contents: Specifications · What Is a 14280 Battery? · 14mm Family Comparison · Charge & Discharge · Cycle Life & Safety · Applications · Certifications · OEM/ODM & Ordering · FAQ

14280 Battery Specifications

All values below are from the controlled product specification EGbatt-Q-PRA-TD-108 (A.2), model NCM14280-035.

Full parameters, test conditions and mechanical drawings are in the downloadable datasheet: NCM14280-035 Specification (EGbatt-Q-PRA-TD-108 A.2).

What Is a 14280 Battery?

A 14280 battery is a rechargeable cylindrical lithium-ion cell whose designation encodes its geometry: 14 mm diameter, 28 mm class height, cylindrical format. At Ø14.1 × 27.7 mm and roughly 11 g, it is one of the smallest li-ion formats in regular production — about one-third the volume of an AA-size 14500 cell.

Unlike AA alkaline cells at 1.5 V, the 14280 delivers 3.7 V nominal (4.20 V fully charged), so it substitutes directly only in devices designed for li-ion input. The cell is a sealed steel can with a CID safety vent; per the controlled specification, welding is permitted only on the top cap and bottom end — never on the side wall.

14280 vs 14250, 14430 and 14500: 14mm Family Comparison

All four models share a 14 mm diameter; length — and therefore capacity — is what separates them. Use this table to confirm fitment before sampling.

A 14250 needs 3 mm of extra clearance to accept the 14280; a 14430 or 14500 will not fit without a mechanical redesign.

14280 Charge and Discharge Profile

Charging follows CC-CV: constant current at 0.5C (175 mA) until the terminal voltage reaches 4.20 V ± 0.05 V, then hold at 4.20 V until the current tapers to the 5 mA cut-off. Standard charge completes in under 3.5 hours. The maximum charge current is 1C (350 mA), which the specification marks as not for cycle use — routine fast charging accelerates capacity fade. Below 15 °C, charge current must be limited to 0.2C (70 mA); the full 1C rate is available only between 15 °C and 45 °C.

Discharging is rated at 2C (700 mA) continuous, again not for cycle use; standard discharge is 0.2C (70 mA) to a 2.75 V cut-off. Rate-discharge testing shows the cell holds ≥90% of its 0.2C capacity at 1C (350 mA) and ≥80% at 3C (1050 mA), so 3C-class pulses are within the cell’s demonstrated envelope — but continuous operation should stay at or below 2C. Discharge must terminate if the cell surface exceeds 60 °C.

Temperature dependence of capacity (per the controlled specification): ≥60% at −20 °C (0.2C), ≥80% at 0 °C (0.5C), 100% at 25 °C, ≥95% at 60 °C (0.5C).

Storage: best long-term storage is −20 °C to 25 °C at 25–35% SOC; cells ship at 40–60% SOC. After 28 days at 25 °C, residual capacity is ≥90% with ≥95% recovery after one standard cycle; after 7 days at 60 °C, the same ≥90%/≥95% thresholds apply.

14280 Cycle Life and Safety Performance

Cycle life is specified at ≥70% of initial capacity after 300 cycles of 1C discharge to 2.75 V at 25 ± 2 °C, with initial capacity defined as the mean of the first three cycles. (Frequent cycling at high temperature ≥35 °C, high rate, or high voltage shortens life; the specification warns against sustained operation ≥60 °C.)

Safety testing per the controlled specification — all with no fire, no explosion, no leakage:

14280 Battery Applications

Personal care — electric toothbrushes and shavers. The dominant application for this format. Motor bursts of 1–2 A fall inside the demonstrated 3C pulse envelope, and the 2C continuous rating covers sustained loads; overnight dock charging at ≤1C matches typical 2–4 hour charge cycles.

TWS earbud cases and Bluetooth accessories. Charging-case cells prioritize compact geometry; the 14.1 × 27.7 mm envelope fits standard case PCBs without custom tooling.

IoT sensors and wearables. Low average drain with periodic radio bursts suits the cell’s low self-discharge; the −20 °C discharge floor covers outdoor and logistics tracking deployments.

Miniature flashlights and emergency lighting. Single-cell 3.7 V drives LEDs directly at low currents; the CID vent adds a safety layer for unattended charging.

Toys, RC and hobby electronics. A protected 3.7 V source in a tight shell, replacing two-cell NiMH stacks with less volume and weight.

Certifications and Shipping Compliance

Every NCM14280-035 ships against the documentation compliance teams ask for first: UN38.3 (the UN Manual of Tests and Criteria test summary required for lithium transport by air and sea), MSDS, IEC 62133-2 cell safety compliance, CB report, and RoHS declaration. Lot-level documentation — capacity, internal resistance and open-circuit voltage per cell — accompanies each shipment so incoming QC starts from data rather than sampling. For background on cell-level safety standards, see the IEC portal and Battery University for charging fundamentals.

OEM/ODM Customization and Ordering

CMX Battery supplies the NCM14280-035 for OEM programs: welded tabs or connectors to your drawing, shrink-wrap or label branding with your model number, and packaging configured to your line — the standard pack is 50 cells per carton, 500 cells per master box. Cells ship at 40–60% SOC. Samples are available for bench validation before volume commitment; minimum order quantities, lead times and per-lot test-data format are confirmed with your quotation, which comes back within 24 hours. Warranty is one year from date of shipment against manufacturing defects.

Frequently Asked Questions

What is a 14280 battery?
A 14280 battery is a small rechargeable cylindrical li-ion cell (Ø14.1 × 27.7 mm, 350 mAh, 3.7 V nominal); the digits encode its diameter and height. Our model is NCM14280-035, built to controlled specification EGbatt-Q-PRA-TD-108 (A.2).

Is the 14280 battery rechargeable?
Yes. It is a secondary li-ion cell rated for repeated CC-CV cycling at 4.20 V, specified at ≥70% capacity retention after 300 cycles at 1C.

What is a 14280 battery used for?
Electric toothbrushes, shavers, TWS charging cases, IoT sensors, mini flashlights and toys — compact devices that need 3.7 V inside a 14 × 28 mm envelope.

How do you charge a 14280 battery?
CC-CV at 0.5C (175 mA) to 4.20 V ± 0.05 V with a 5 mA taper cut-off; standard charge takes under 3.5 hours. Do not exceed 1C (350 mA) for routine cycling, and limit to 0.2C below 15 °C.

What is the maximum discharge current?
2C (700 mA) continuous. Rate testing demonstrates ≥80% capacity delivery at 3C (1050 mA) pulses, but continuous operation should stay at or below 2C.

Can I use a 14430 or 14500 instead of a 14280?
Not without redesign. Both are physically longer (43 mm and 50 mm versus 27.7 mm); only the shorter 14250 is dimensionally close, and it needs 3 mm of extra clearance.

Is the 14280 available with OEM branding?
Yes — welded tabs or connectors, custom labels with your model number, and tailored packaging are standard services. Cells ship at 40–60% SOC with per-lot test data.

Request a Quote

Send your target voltage, capacity, continuous current and mechanical envelope — you will receive a datasheet-matched quotation, sample options and lead time within 24 hours.

Or email sales@cmxbattery.com. Download the full datasheet: NCM14280-035 Specification (EGbatt-Q-PRA-TD-108 A.2, PDF).