Worx WA3127 18V Ni-MH Replacement Battery 2000mAh

Worx WG150s / WG152 / WG250 / WG541 18V Ni-MH Replacement Battery (WA3127)

This is an 18V, 2000mAh Ni-MH replacement battery carrying OEM part number WA3127. It fits the Worx WG150s, WG152, WG250, and WG541 cordless string trimmers and edgers. Voltage and cell format match the original pack exactly.

• WG150s / WG152 / WG250 / WG541 platform fit: These models share the same 18V battery rail, slide-in connector, and BMS handshake protocol one pack covers the whole family without adapter hardware or firmware conflicts.
• Bench tested on actual hardware: We cycled this pack through simulated trimmer load profiles on the bench. The BMS handled motor-start inrush without tripping overcurrent and held voltage within spec across the discharge curve.
• Ni-MH break-in on first use: Ni-MH cells need two to three full charge-discharge cycles before reaching rated capacity. Run the trimmer at a moderate load through a complete discharge each time the cells will reach full 2000mAh output by cycle three.

Charger blinking red on WA3127 pack after storage

Ni-MH packs sitting unused for several months self-discharge below the charger’s acceptance threshold typically under 10V on an 18V pack. The charger reads this as a fault and blinks red instead of starting a charge cycle. Most Worx chargers include a recovery mode: hold the pack in the charger for 1015 minutes and the unit will trickle-charge the cells up to acceptance voltage before switching to normal charge. If the charger does not recover the pack within 20 minutes, check terminal voltage directly anything above 9V is recoverable with a compatible NiMH recovery charger.

Trimmer bogs or loses power mid-cut through thick grass

Sustained high load through dense grass forces the motor to draw continuous peak current, which heats both the motor housing and the battery cells simultaneously. Ni-MH cells have higher internal resistance than Li-ion, so voltage sag under load is more pronounced particularly as the pack ages. The BMS will cut power if cell temperature exceeds its thermal threshold, causing the tool to stop mid-cut. Let the pack cool for five minutes, then check resting voltage: if it reads above 16V at rest, the cutoff was thermal, not a capacity failure the pack will resume normally once cooled.