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Sodium Ion 32140 Cylindrical Cells - Rechargeable Battery SIB Na-ion Cell

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£75.00 GBP

~~£113.00 GBP~~ £75.00 GBP

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Count 4 PCS 20 PCS 100 PCS

The Big-Format Sodium Ion Cell — More Power, Same Safe Chemistry.

The 32140 is the large-format cylindrical sodium-ion cell that serious DIY builders have been waiting for. At 10Ah and 30Wh per cell, this is roughly 8× the capacity of our 18650 sodium-ion cell in a single robust package — ideal for EV conversions, e-bikes, car jump starters, marine/RV packs, and stationary solar storage.

Like all sodium-ion chemistry, the 32140 delivers outstanding cold-temperature performance, operates safely with no thermal runaway risk comparable to lithium cobalt chemistries, and is built from abundant, responsibly sourced sodium — making it a genuinely sustainable choice. The layered oxide cathode gives it a higher working voltage and energy density than polyanion (NFPP) or Prussian blue sodium chemistries, while the large 32mm diameter format allows for very low internal resistance (≤3mΩ AC) and high peak discharge rates up to 10C continuous.

These cells have passed UN38.3 safety testing and are shipping-certified. A BMS is always recommended for pack builds — see our spot welding and BMS notes below.

Cell Size & Physical Specs

32140
- Dimensions: Ø32.2 mm × 140 mm (±tolerance)
- Weight: 265 ±5g (approx. 9.35 oz)
- Energy: 30Wh per cell
- Energy Density: ≥110 Wh/kg

Key Features

Large-Format, High-Capacity Design: At 10Ah per cell, the 32140 dramatically reduces cell count for pack builds compared to 18650-format cells — fewer welds, fewer connections, simpler BMS wiring.
Extreme Cold-Weather Performance: Rated for discharge down to -40°C — outperforms LFP in freezing conditions. Ideal for off-grid, marine, and northern-climate applications.
High Discharge Rate Capability: Supports 10C continuous (100A) and up to 15C peak — well-suited for jump starters, power tools, and high-draw EV/e-bike applications.
Ultra-Low Internal Resistance: AC impedance ≤3mΩ at 1kHz means minimal heat generation and excellent efficiency even under high load.
Long Cycle Life: Rated for 2,000–3,000+ charge/discharge cycles depending on depth of discharge and temperature — significantly extending pack life over lead-acid and many lithium chemistries.
Safer Chemistry: Sodium-ion cells use no lithium cobalt oxide — dramatically lower flammability risk. The large-format construction also reduces the number of cells in series, simplifying thermal management.
UN38.3 Transport Certified: These cells have passed the international standard for lithium and sodium battery air/ground shipment safety testing.
Sustainable Sodium Technology: Sodium is more abundant and less geopolitically constrained than lithium, offering a lower long-term cost trajectory and a reduced environmental footprint.

Product Specifications

Parameter	Value
Cell Format	Cylindrical 32140
Cell Chemistry	Sodium-ion (Layered Oxide)
Nominal Voltage	3.0V
Nominal Capacity	10Ah (0.5C @ 25°C)
Nominal Energy	30Wh
Charge Cut-Off Voltage	3.5V – 4.0V
Discharge Cut-Off Voltage	1.5V – 2.0V
Standard Charge Current	0.5C (5A)
Max Charge Current	3C (30A)
Standard Discharge Current	0.5C (5A)
Max Continuous Discharge	10C (100A)
Peak Discharge (pulse)	15C (150A)
Internal Resistance (AC)	≤3mΩ (1kHz @ 3.2V)
Internal Resistance (DC)	≤10mΩ (2C, 30s @ 3.2V)
Energy Density	≥110 Wh/kg
Volumetric Energy Density	~248 Wh/L
Charging Temperature	-20°C to 70°C
Discharging Temperature	-40°C to 60°C
Storage Temperature	-20°C to 30°C @ 50% SOC
Cell Weight	265 ±5g
Dimensions	Ø32.2 mm × 140 mm
Cycle Life	≥2,000 cycles to 80% SOH
Safety Certification	UN38.3 Passed

Sodium-Ion Chemistry Comparison — Which Format Is Right for You?

Characteristic	18650 (1.3Ah) — Layered Oxide	32140 (10Ah) — Layered Oxide
Capacity per Cell	1,300mAh	10,000mAh (10Ah)
Nominal Voltage	3.05V	3.0V
Energy per Cell	~4Wh	30Wh
Max Discharge Rate	6C	10C continuous / 15C peak
Best For	Small packs, prototyping, flashlights, e-skate	EV, e-bike, jump start, solar storage, marine/RV
Cold Temp Discharge	-40°C	-40°C
Cycle Life	≥1,000 cycles	≥2,000 cycles

Pack Building & Spot Welding Notes

The 32140 is a large-format cell and behaves differently from 18650 cells during spot welding and pack assembly. Follow these guidelines for best results:

Always use a BMS (Battery Management System) sized for your pack voltage and max discharge current.
Use nickel strip rated for the current you plan to draw — at 10C, these cells can push 100A peak.
Start with a mid-power spot welder setting. These larger terminals require more dwell time but are more tolerant of heat than 18650-format cells.
Test connections with a pull-force check before closing your pack.
Never short-circuit or overdischarge below 1.5V — always verify your BMS cutoff settings before first charge.

Recommended BMS: Use a sodium-ion compatible BMS with a 3.0V nominal cell voltage setting. Most modern multi-chemistry BMS units support sodium-ion — confirm the charge cutoff can be set between 3.5V–4.0V and discharge cutoff to 1.5V–2.0V. Contact us if you need BMS recommendations for your specific build.