USED HEADWAY 38120 HP 3.2V 8AH LIFEPO4 BATTERY

Availability Update: We’ve completely sold out of HEADWAY cells and are no longer receiving new batches. We do not expect to restock these again.

You’re welcome to add your name to the “Notify Me When Available” list in case we ever come across another batch, but at this time we don’t anticipate future availability.

We currently don’t have other cells with similar specs, but if we find comparable options, we’ll post them here.

This product is fulfilled through our affiliate partner, BatteryHookup.

Used Headway 38120HP 3.2V 8Ah LiFePO4 Cells

These Headway 38120HP LiFePO4 cells come from engineering samples or generator backup packs and continue to test near full capacity. They deliver exceptional power output and long cycle life at a fraction of the cost of new cells.

Each cell includes mounting screws for easy assembly. Busbars and holders are also available at very affordable prices.

High‑Power Performance

These large-format cylindrical cells are capable of extremely high current delivery:

• 200A continuous discharge
• 80A continuous charge

Four cells in series can even start a vehicle. Please ensure your wiring, busbars, and safety practices are rated for the current these cells can deliver.

Capacity & Testing

We’ve tested thousands of these cells. Expect an average of 90–100% of original capacity at a standard 0.2C (1.6A) discharge rate. They offer excellent value and long remaining life.

Ideal Applications

LiFePO4 chemistry is ideal for 12V systems—four cells in series match the voltage of a lead‑acid battery. Perfect for:

• RVs and off‑grid systems
• EV conversions
• Competition car audio
• Custom 12V battery builds

Specifications

Chemical Composition	LiFePO4
Nominal Capacity	8Ah
Nominal Voltage	3.2V
Charging Voltage	3.65V
Cut‑off Discharge Voltage	2.0V
Charging Method	CC/CV
Max Continuous Discharge	200A
Max Continuous Charge	80A
Cycle Life	1500 cycles @ 1C, 100% DOD 2000 cycles @ 1C, 80% DOD
Operating Temperature	Charge: -10℃ to 45℃ Discharge: -20℃ to 65℃
Energy Density	83 Wh/kg
Internal Impedance	<4mΩ
Dimensions	Diameter: 38mm Length: 120mm (152mm with screw)
Weight	360g

Why Builders Love These Cells

These 38120HP cells deliver roughly 40× the power of standard 18650 cells, making them a favorite for high‑demand DIY projects. Their performance specs are real, tested, and verified.