Powilling 2Pack 3.5Ah 20V Battery Replacement for Worx Battery 20V WA3578 WA3575 WA3520 WA3525 WG151s WG155s WG251s WG255s WG540s WG545s Compatible with Worx 20V Battery, blakc and orange

What It Is

This is a pair of aftermarket 3.5Ah 20V lithium-ion batteries designed to power any Worx 20V cordless lawn mower, trimmer, blower, or hedge trimmer that uses the WA3578, WA3575, WA3520, WA3525, or WA3xxx series batteries. They also replace the WG151s, WG155s, WG251s, WG255s, WG540s, and WG545s packs.

Fitment & Compatibility

Before buying, verify your Worx tool’s battery port is the standard slide-on “20V Power Share” style (flat, rectangular with two rails). These will not fit Worx 40V, 60V, or 80V tools, nor any older Ni-Cd models. Check your original battery’s model number (printed on the label) against the list above. The 3.5Ah capacity is a 30% upgrade over the stock 2.5Ah packs, so they are slightly taller and heavier—measure your battery compartment depth if your tool has a closed housing. They are not compatible with Worx chargers that require a proprietary communication chip (rare, but check your charger’s manual).

Key Things to Buy

• Quality varies: Aftermarket cells often have lower cycle life than OEM Worx batteries (typically 300-500 vs 500-800 charges). Expect reduced runtime after 1-2 seasons of heavy use.
• Installation is instant: Slide onto the tool until it clicks. No tools, wires, or modifications needed.
• Charger compatibility: Works with any standard Worx 20V charger (e.g., WA3730, WA3880). Do not use with a 40V charger.
• Safety first: These lack the over-discharge protection of genuine Worx packs. Stop using when power drops noticeably to avoid damaging the tool.

Should You Buy It

Right for budget-conscious owners with multiple Worx 20V tools who want extra runtime without buying OEM packs. Skip if you need maximum longevity, heavy daily use, or are using a high-draw tool like a snow blower—stick with genuine Worx batteries for better thermal management and warranty coverage.