46950 LiFePO4 Battery 3.2V 25Ah | IFR46950 LFP Cylindrical Cell

46950 LiFePO4 Battery — IFR46950 25Ah 3.2V Cylindrical LFP Cell

The 46950 LiFePO4 battery (model IFR46950) is the 25Ah class at the top of the cylindrical LFP ladder: Ø46.0 × 95.0 mm, 25 Ah at 3.2 V nominal — 80 Wh per cell at ≈178 Wh/kg, with ≤2 mΩ internal resistance and ≥5000 cycles at 80% DOD. It is the capacity step that halves cell count again versus the 15Ah class: a 51.2 V / 100 Ah pack is 64 cells in 46950 against 112 in 32140/33140 and ≈272 in 32700. CMX Battery supplies the format as a production-line benchmark to the CHAM 46950S25E and Gotion IFR46950A envelope, 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 · Reference Benchmarks · What Is a 46950 LiFePO4 Battery? · The Ladder: 6Ah → 15Ah → 25Ah · Pack Economics · Charge & Discharge · Cycle Life & Safety · Applications · Certifications · OEM/ODM & Ordering · FAQ

46950 LiFePO4 Battery Specifications

Typical values below reflect published manufacturer specifications for the two benchmark lines; final parameters ship against the CMX controlled product specification.

Reference Benchmarks: CHAM 46950S25E vs Gotion IFR46950A

The 46950 envelope is an industry standard; the two published references differ on capacity, not geometry — the choice is capacity step versus installed-base standardization.

What Is a 46950 LiFePO4 Battery?

A 46950 LiFePO4 battery is a rechargeable cylindrical cell whose designation encodes its geometry — 46 mm diameter, 95 mm length — with lithium iron phosphate chemistry at a 3.2 V nominal platform. The IFR prefix follows the IEC convention for cylindrical LFP cells (I = lithium-ion, F = iron phosphate, R = round).

The format is the top step of the large cylindrical ladder: it carries the highest energy per cell (≈80 Wh) and the lowest internal resistance (≤2 mΩ) of the formats CMX supplies, which is why it anchors high-capacity stationary storage builds. The full format ladder — including formats CMX does not produce, such as 4680 and 38121 — is mapped in our large cylindrical cell size guide.

Like every cylindrical LFP, 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.

The Cylindrical LFP Ladder: 6Ah → 15Ah → 25Ah

Each step up the ladder trades charge rate and second-source depth for cell count, energy density and cycle life.

See the 32700 product page for the 6Ah step and the 32140 vs 33140 comparison for the 15Ah step.

Pack Economics: 64 Cells for a 51.2V 100Ah Pack

For a pack builder running volume, that difference lands directly in cost of goods: fewer welds, fewer busbars, fewer BMS channels, less assembly labor. The 25Ah class also carries the highest gravimetric energy density (≈178 Wh/kg) of the ladder, which matters for weight-sensitive installations such as wall-mounted residential storage. The trade-off is rate and flexibility — a 25Ah design is locked to its capacity step, and 2C continuous is the ceiling. Step-by-step configuration math is in our pack configuration guide.

IFR46950 Charge and Discharge Profile

Charging follows CC-CV on the LFP profile: constant current at 0.5C (12.5 A) standard or 1C (25 A) fast until terminal voltage reaches 3.65 V, then hold at 3.65 V until current tapers below the cut-off threshold. Never charge an IFR46950 with a 4.2 V li-ion charger — the 3.65 V ceiling is a hard chemistry limit. The 0.5C standard rate recovers a full cycle in roughly 2.5 hours, which suits day-cycling solar storage; the 1C fast rate halves that where the charge window is tight.

Discharging is rated 2C (50 A) continuous. The ≤2 mΩ internal resistance keeps voltage sag at ≈100 mV under full 2C load — the lowest of the ladder — which simplifies BMS balancing and preserves usable capacity in high-rate strings. If your pack needs sustained 3C output, the 6Ah 32700 class is the right cell; the 25Ah format is an energy cell, not a power cell.

IFR46950 Cycle Life and Safety Performance

Cycle life is specified at ≥5000 cycles at 80% DOD under 0.5C/0.5C test conditions — the strongest rating on the CMX ladder, roughly 14 years of daily cycling. Compare cycle claims at your operating temperature, DOD and rate rather than the headline number; a 5000-cycle rating at 0.5C does not automatically hold at 1C or at 45 °C.

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.

46950 LiFePO4 Battery Applications

C&I and residential ESS. 16S4P blocks deliver 51.2 V / 100 Ah (5.12 kWh) from 64 cells — the format’s core value proposition; 16S2P builds 51.2 V / 50 Ah from 32 cells.

High-capacity telecom and UPS backup. The lowest internal resistance of the ladder supports high-rate backup discharge with minimal sag; 64 cells per 100Ah block halves the BMS channel count of a 6Ah build.

Weight-sensitive solar storage. ≈178 Wh/kg gravimetric density reduces pack mass at a given kWh, easing wall-mount and mobile installations.

Certifications and Shipping Compliance

Every 46950-class cell 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.

OEM/ODM Customization and Ordering

CMX Battery supplies IFR46950 cells as a Grade-A cells supplier 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; 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, alongside the manufacturer warranty where applicable.

Frequently Asked Questions

What is a 46950 LiFePO4 battery?
A 46950 LiFePO4 battery is a rechargeable cylindrical LFP cell — Ø46 × 95 mm, 25 Ah at 3.2 V (≈80 Wh) — the 25Ah class at the top of the cylindrical ladder, with ≤2 mΩ internal resistance and ≥5000 cycles at 80% DOD.

How many 46950 cells for a 51.2V 100Ah battery?
64 cells (16S4P): a 51.2 V nominal pack needs 16 cells in series at 3.2 V per cell, and 100 Ah at the 25Ah step needs 4 parallel strings. The same pack needs ≈272 cells in 32700 (6Ah) or 112 in 32140 (15Ah).

What is the difference between CHAM 46950S25E and Gotion IFR46950A?
Same Ø46 × 95 mm envelope, different capacity steps: CHAM publishes the 25Ah (80 Wh) benchmark; Gotion’s IFR46950A is rated ≈20.1 Ah (≈64 Wh). Specify by manufacturer model code rather than the size name — they are not drop-in substitutes at the capacity level.

46950 vs 32700 — which should I choose?
The 32700 (6Ah) wins on charge rate (1C standard, 3C continuous), second-source depth and format flexibility; the 46950 (25Ah) wins on cell count (64 vs ≈272 per 100Ah pack), energy density (≈178 Wh/kg) and cycle life (≥5000 vs ≥2000). Choose 32700 for high-rate or fast-recharge duty, 46950 for high-capacity stationary storage.

Is the 46950 a high-rate cell?
No — it is an energy cell rated 2C (50 A) continuous. Sustained high-rate duty belongs to the 6Ah 32700 class (3C continuous); check the rate table on the specific line’s datasheet before designing for higher rates.

What is the cycle life of a 46950 LiFePO4 cell?
≥5000 cycles at 80% DOD under 0.5C/0.5C test conditions on the CHAM 46950S25E benchmark — roughly 14 years of daily cycling. Anchor procurement to the manufacturer datasheet and its test conditions; ratings do not automatically hold at higher rates or elevated temperature.

Is the 46950 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 destination market — 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: IFR46950 Typical Specifications Overview (PDF). The controlled product datasheet is issued with your quotation on request.