32140 Sodium-Ion Battery Cell 3.0V 10Ah (30Wh), Layered Oxide Na-ion

• Format: 32140 cylindrical, steel case (Ø32 × 140 mm)
• Chemistry: Sodium-ion, layered oxide class
• Nominal Voltage: 3.0 V
• Nominal Capacity: 10 Ah at 0.5C, 25 °C (≈30 Wh, ~110 Wh/kg)
• Charge Voltage: 3.95 V CC-CV, cut off at 0.05C (never exceed 4.0 V)
• Discharge Cut-off: 2.0 V recommended floor
• Standard Charge / Discharge: 0.5C (5 A)
• Max Charge Current: 1C (10 A) at 15 to 30 °C; 0.5C (5 A) below 15 °C
• Max Continuous Discharge: 3C (30 A)
• Pulse Discharge: 10C (100 A) for up to 10 seconds
• Internal Resistance: ≤3 mΩ (AC 1 kHz)
• Cycle Life: ≥1,500 cycles to 80% across all batches; the current batch is rated ≥6,000 cycles to 80% (0.5C/0.5C, 25 °C)
• Charge Temperature: 0 °C to 45 °C recommended (no charging below 0 °C)
• Discharge Temperature: −20 °C to 60 °C
• Storage: −10 °C to 35 °C for up to 6 months
• Weight: 265 ±5 g

Per the current batch's manufacturer specification, the cell passed these tests with no fire and no explosion:

• Overcharge: charged at 1C to 4.345 V and held.
• Short circuit: fully charged cell shorted through 80 mΩ; surface stays under 150 °C.
• Forced discharge: reverse-charged at 1C for 90 minutes.
• Heat: 130 °C hot box for 30 minutes.
• Crush: squeezed between flat plates to 13 kN.
• Impact: 9.1 kg weight dropped 610 mm onto a bar across the cell.

Shipping note: sodium-ion cells ship as Class 9 dangerous goods under UN3551, the sodium-ion entry, not the lithium-ion one.

Rule of thumb: the 32140 is an energy cell, not a power cell. If your pack needs more than about 3C, add cells in parallel or use our NFPP 18650.

Add strings in parallel to scale capacity: a 16S3P 48V pack uses all 48 cells of our 48-pack and stores about 1.44 kWh.

Check your inverter or controller first. A 16S pack at 3.95 V per cell reaches 63.2 V, above the battery limit of most 48V inverters, and those inverters usually shut off around 40 V (2.5 V per cell). For 48V gear, charge a 16S pack to about 3.6 V per cell (57.6 V), or run 15S. Match the pack to the input window, not to the nameplate voltage.

• Spot weld, don't solder. The factory advises against high-temperature welding on the terminals, including welded-on studs. Use a resistance spot welder and pure nickel strip.
• Nickel strip: 0.1 to 0.15 mm pure nickel for most builds. 0.2 mm works but needs much more welder power. Stack strips or add copper for higher current.
• Welder setting: start medium-low and test on a scrap tab first. Too much power damages the terminal, too little gives weak joints.
• 2 to 4 welds per connection is plenty for most packs. More welds add strength but also heat.
• Insulate: put PET or fish paper between the cells and any strip that crosses a cell top.
• BMS: use a programmable unit (JK, Daly, ANT) that accepts a 3.95 V charge limit and a 2.0 V low cut-off, with a low-temperature charge cut-off at 0 °C.
• Never use an LFP or lithium-ion charger profile without reconfiguring it for sodium.