Worx WA3580 40V Replacement Battery 2500mAh Li-ion

Worx WG180 / WG580 40V Platform — 40V Li-ion Replacement Battery (WA3580)

This is a 40V, 2500mAh Li-ion replacement battery carrying OEM part number WA3580. It fits the Worx 40V platform, covering the WG180, WG280, WG380, and WG580 cordless garden tools. Voltage and capacity match the original pack spec exactly.

• Worx 40V platform compatibility: The WG180, WG280, WG380, and WG580 share the same 40V battery rail, connector format, and BMS handshake protocol. One pack runs across all four tools without any adapter or modification.
• Bench tested on actual hardware: We cycled this pack through full charge-discharge sequences and monitored the BMS under simulated motor-start inrush loads. The overcurrent protection tripped at expected thresholds and reset cleanly each time.
• First-use load conditioning on 40V motors: Run the tool at half load for two cycles before applying full torque. This allows the BMS to profile the motor's inrush current draw and calibrate its overcurrent thresholds before you hit maximum demand applications.

BMS cutoff on motor-start inrush surge across the WG-series

When you pull the trigger on a brushless 40V motor, the initial inrush current can spike two to three times the steady-state draw. If the BMS has not yet profiled the motor load — common on a new or freshly stored pack — it can interpret that spike as a fault and cut the output rail. The tool goes dead for two to four seconds, then recovers. Running two partial-load cycles first gives the BMS enough data to set a realistic overcurrent threshold and stop false trips on normal start-up pulls.

Charger blinks red and never starts a charge cycle after storage

Li-ion cells that sit unused for several months can drop below the charger's acceptance voltage — typically around 2.5V per cell. When that happens, most Worx 40V chargers refuse to start a full charge cycle and signal the fault with a red blink. The fix is a recovery or "wake-up" charge: place the pack on the charger, remove it after 30 seconds, and re-seat it firmly. Repeat two to three times until the charger registers a voltage above its acceptance threshold and transitions to normal charge mode.