Worx WA3580 40V 1500mAh Replacement Battery for WG180

Worx WG180 / WG280 / WG380 / WG580 Series — 40V Li-ion Replacement Battery (WA3580)

This is a 40V 1500mAh (60Wh) Li-ion battery pack built to the WA3580 specification. It fits the Worx WG180, WG280, WG380, and WG580 cordless trimmer and edger series. Slot it into any compatible charger and tool — the connector and BMS handshake match the original pack.

• WG180 / WG280 / WG380 / WG580 platform fit: All four models share the same 40V battery rail, slide-latch connector, and BMS communication protocol. One pack works across the entire lineup without adapters or firmware differences.
• Bench tested on actual hardware: We cycled this pack through repeated motor-start inrush events on a WG180 trimmer. The BMS held the overcurrent threshold correctly and did not trip during normal trigger pulls at full load.
• First-use load conditioning on trimmer motors: Run the trimmer at half throttle for the first two full discharge cycles before sustained full-speed cutting. This lets the BMS profile the motor's inrush current draw and set overcurrent protection thresholds accurately before you push it into dense grass or thick growth.

BMS cutoff on trigger pull during dense vegetation cutting

When the trimmer head bites into thick grass or weeds, the motor draws a sharp inrush spike before it reaches operating speed. On a new or storage-depleted pack, the BMS may read that spike as an overcurrent fault and cut power instantly. The fix is gradual load conditioning — two cycles at partial throttle recalibrates the BMS trip threshold to the actual motor profile. After conditioning, full-throttle cuts into dense growth should not trigger a cutoff.

Charger shows blinking red and won't begin charging after storage

Li-ion packs stored uncharged for more than a few months can drop below the charger's acceptance voltage floor — typically around 30V on a 40V system. The charger detects a cell voltage it considers unsafe and refuses to start the charge cycle, showing a blinking red fault light. Remove the pack, wait 60 seconds, and reinsert it to trigger a fresh handshake. If the charger still rejects the pack, check cell voltage at the terminals — anything above 28V should respond to a trickle-mode charger or a second reinsertion attempt.