32650 LiFePO4 Battery 3.2V 6000mAh | IFR32650 LFP Cylindrical Cell

32650 LiFePO4 Battery — IFR32650 6000mAh 3.2V Cylindrical LFP Cell

The 32650 LiFePO4 battery (model IFR32650) is the 6Ah class of the cylindrical LFP range: Ø32.2 × 70.5 mm, 6000 mAh at 3.2 V nominal — 19.2 Wh per cell, three times the capacity of an IFR26650 in the same family. It sits at the entry rung of the large cylindrical ladder that stationary storage buys in volume: ESS strings, telecom backup blocks, light-EV packs and solar storage assemblies that need more energy per cell without moving to the 15Ah formats. CMX Battery supplies it as a Grade-A LiFePO4 cell with per-lot capacity, IR and OCV test data, UN 38.3 / IEC 62619 / CE / MSDS documentation, MOQ 100 pcs and 15-day lead time.

Table of contents: Specifications · What Is a 32650 LiFePO4 Battery? · 32650 vs 32700 · Charge & Discharge · Cycle Life & Safety · Applications · Certifications · OEM/ODM & Ordering · FAQ

32650 LiFePO4 Battery Specifications

Typical values below reflect the production standard for this format across established manufacturers; final parameters ship against the CMX controlled product specification.

What Is a 32650 LiFePO4 Battery?

A 32650 LiFePO4 battery is a rechargeable cylindrical cell whose designation encodes its geometry — 32 mm diameter, 65 mm nominal length in the original convention — with lithium iron phosphate chemistry at a 3.2 V nominal platform. The IFR prefix is the IEC convention for cylindrical LFP cells (I = lithium-ion, F = iron phosphate, R = round).

One market reality deserves emphasis: the 32650 name covers two can lengths. True 65 mm cans exist (Howell HWE IFR32650, Orange IFR32650-6000mAh), but a large share of cells sold as “32650” — including the CMX line at Ø32.2 × 70.5 mm — ship in 70 mm cans dimensionally identical to a 32700. Always confirm the datasheet dimension line rather than the model code before committing to a holder or sleeve. The full analysis is in our 32650 vs 32700 comparison.

The cell is a sealed steel can with a CID safety vent; welding is permitted only on the top cap and bottom end, never on the side wall. Its flat 3.2 V discharge curve holds voltage nearly constant across most of the capacity range, so a 16S string (51.2 V nominal) delivers a stable input to storage inverters through most of the discharge.

32650 vs 32700: Choosing the 6Ah Format

Both cells share the Ø32 mm diameter and the 6Ah class; the practical differences are length, internal resistance and charge window.

For a 51.2 V / 15 Ah pack either format needs 48 cells (16S3P) — pack economics are identical, so the choice comes down to internal resistance, charge rate and supply depth. See the full 32650 vs 32700 analysis or the 32700 product page.

IFR32650 Charge and Discharge Profile

Charging follows CC-CV on the LFP profile: constant current at the standard 0.2C rate until terminal voltage reaches 3.65 V, then hold at 3.65 V until current tapers below the cut-off threshold, within a 0–45 °C window. Never charge an IFR32650 with a 4.2 V li-ion charger — the 3.65 V ceiling is a hard chemistry limit. Below 0 °C, limit current or skip charging.

Discharging is rated 3C (18 A) continuous with 5C (60 A) pulses limited to 2.0 V. At 3C, cell heat depends directly on internal resistance: a 25 mΩ cell dissipates roughly 8 W versus 2.6 W for an 8 mΩ cell — a pack-level thermal design factor, and one reason the 32700 line’s lower resistance matters for high-rate duty.

IFR32650 Cycle Life and Safety Performance

Cycle life is specified at 2000+ cycles to ≥80% capacity retention — in a daily-cycling storage application that translates to five or more years of service. Published 32650-class cells span 2000 to 3000+ cycles depending on test conditions (temperature, C-rate, DOD); compare at your operating point, not the headline number.

Safety testing covers over-discharge, overcharge, external short circuit, thermal abuse, drop, vibration and temperature shock — all with no fire, no explosion, no leakage. The LFP chemistry’s higher thermal runaway onset temperature removes the propagation concern in multi-cell series configurations, which is why the format is trusted in telecom cabinets and occupied-space installations.

32650 LiFePO4 Battery Applications

Energy storage systems (ESS). 16S3P blocks deliver 51.2 V / 15 Ah (≈922 Wh) from 48 cells; the 19.2 Wh cell size scales strings cleanly from residential buffers to C&I cabinets.

Telecom backup. Flat discharge curve and 2000+ cycle life suit remote cabinet duty; per-lot test data simplifies incoming QC for regulated deployments.

Light EV and mobility packs. 3C continuous covers e-scooter, e-rickshaw and AGV drive current; the Ø32 mm can fits standard holders and fixtures.

Solar storage and off-grid packs. Standardized can size simplifies DIY and OEM storage assemblies; 2000+ cycles at full DOD match daily charge-discharge duty.

Certifications and Shipping Compliance

Every IFR32650 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 62619 industrial storage safety compliance, and CE 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.

OEM/ODM Customization and Ordering

CMX Battery supplies the IFR32650 for OEM programs: welded tabs or connectors to your drawing, shrink-wrap or label branding with your model number, BMS integration for pack orders from 12 V to 51.2 V, and packaging configured to your line. Cells ship at partial SOC with per-lot test data. MOQ 100 pcs, samples available, 15-day lead time on standard grades; minimum order quantities and lead times 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 32650 LiFePO4 battery?
A 32650 LiFePO4 battery is a rechargeable cylindrical LFP cell rated 6000 mAh at 3.2 V nominal (≈19.2 Wh), Ø32.2 × 70.5 mm — the 6Ah class of the large cylindrical ladder, built for ESS, telecom backup and light-EV packs.

What is the difference between 32650 and 32700?
Both are Ø32 mm, 6Ah cylindrical LFP cells. The 32650 ships with ≤25 mΩ internal resistance and 0.2C standard charge; the 32700 line offers ≤8 mΩ and 1C charging with a 0–60 °C charge window. A 51.2 V / 15 Ah pack needs 48 cells in either format.

Are 32650 and 32700 the same size?
They share the same Ø32 mm diameter. Nominal length differs — 65 mm in the original 32650 convention versus 70 mm for the 32700 — but many cells sold as “32650”, including the CMX line, ship in 70.5 mm cans identical to a 32700. Check the datasheet dimension line.

How many amps can a 32650 LiFePO4 discharge?
3C (18 A) continuous with 5C (60 A) pulses limited to 2.0 V. At 18 A, internal resistance sets both voltage sag and heat: 450 mV and ≈8 W at 25 mΩ versus 144 mV and ≈2.6 W at 8 mΩ.

How do you charge a 32650 LiFePO4 battery?
CC-CV to 3.65 V with taper cut-off; standard charge 0.2C (1.2 A) within 0–45 °C. Never use a 4.2 V li-ion charger — the 3.65 V ceiling is a hard chemistry limit.

How long does an IFR32650 last?
2000+ cycles to ≥80% capacity retention — five or more years in daily-cycling service. Published 32650-class ratings reach 3000+ cycles at favorable test conditions.

Is the 32650 LiFePO4 available for OEM programs?
Yes — welded tabs or connectors, custom labels with your model number, BMS integration and tailored packaging are standard services, with per-lot test data on every shipment. MOQ 100 pcs, 15-day lead time.

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 typical specifications overview: IFR32650 Typical Specifications Overview (PDF). The controlled product datasheet is issued with your quotation on request.