2 Pack 6.5Ah Replacement Battery for Worx 20V Compatible with Worx 20 Volt Lithium WA3520 WA3525 WG151s WG155s WG251s Cordless Power Tools Battery

What It Is

This is a 2-pack of 6.5Ah lithium-ion replacement batteries for Worx 20V cordless tools, primarily designed for lawn mowers (e.g., WG151s, WG155s, WG251s) but also compatible with trimmers, blowers, and other Worx 20V tools.

Fitment & Compatibility

• Check model number: Works with Worx 20V batteries WA3520, WA3525, and tools WG151s, WG155s, WG251s, plus many other Worx 20V cordless tools. Not compatible with 40V or 12V systems.
• Physical fit: Same dimensions as OEM WA3520/WA3525 – slides into standard Worx 20V battery ports. No adapter needed.
• Deck/mower size: For mowers, it fits 14-20 inch decks that use the WA series batteries. Larger decks may require two batteries in parallel (if supported) or higher Ah for longer run time.
• OEM vs aftermarket: This is an aftermarket replacement, not genuine Worx. It may not charge in all Worx chargers – verify charger compatibility (most Worx 20V chargers work, but some older units may not).

Key Things to Know

• Run time: 6.5Ah is high capacity – expect 45-60 minutes of mowing on a single charge, depending on grass conditions and mower model.
• Installation: No tools needed – just slide battery into tool until it clicks. Ensure fully seated before use.
• Common gotcha: Some users report slightly tighter fit than OEM batteries. If it doesn’t slide easily, check for debris in the slot. Do not force.
• Quality note: Aftermarket lithium cells may have slightly shorter lifespan than OEM. The 4.5-star rating suggests good performance, but not all units are identical – test immediately on arrival.

Should You Buy It

Buy this if you need a cost-effective high-capacity battery pack for Worx 20V tools and don’t mind an aftermarket option. It’s ideal for users with multiple Worx tools who want extended run time without paying OEM prices. Skip it if you require guaranteed OEM compatibility or plan to use with older Worx chargers (verify first).