18V 4.0Ah Ni-MH WA3127 Replacement for Worx Battery 18V Compatible with Worx WA3127 WA3152 WG150 WG152 Cordless Power Tools

What It Is

This is an 18V 4.0Ah Ni-MH battery replacement for Worx cordless lawn mowers and power tools that use the WA3127 platform. It’s designed to power small electric mowers, trimmers, blowers, and other 18V Worx tools.

Fitment & Compatibility

• Direct replacement for: Worx WA3127, WA3152, WG150, WG152 batteries.
• Fits Worx models: WG150, WG152, WG155, WG156, WG160, WG163, WG170, WG172, WG173, WG180, WG181, WG182, WG183, WG184, WG185, WG186, WG187, WG188, WG189, WG190, WG191, WG192, WG193, WG194, WG195, WG196, WG197, WG198, WG199, and many other 18V Worx tools that use the slide-on battery mount.
• Check before buying: Verify your tool’s model number and battery slot shape. This is a slide-on battery, not a post-style. Measure the battery compartment – it’s about 5.5 x 3 x 2.5 inches. Will not work with older Worx 18V tools that use the WA3020 or WA3128 batteries.
• OEM vs aftermarket: This is an aftermarket replacement, not genuine Worx. It may lack the same over-discharge protection or charge cycle life as OEM.

Key Things to Know

• Ni-MH chemistry: This is nickel-metal hydride, not lithium-ion. It’s heavier, has lower energy density, and suffers from memory effect if not fully drained before recharging.
• Installation: No tools needed – slides directly onto the tool’s battery port. Ensure the locking tab clicks firmly into place.
• Charger compatibility: Works only with Worx 18V Ni-MH chargers (like model WA3741, WA3742, WA3743). Do not use a lithium-ion charger – it will damage the battery.
• Common gotcha: Ni-MH batteries self-discharge faster than lithium – store charged and recharge every 2-3 months if unused. Also, capacity may drop noticeably in cold weather.

Should You Buy It

If you own an older Worx 18V tool that uses Ni-MH batteries and you don’t want to upgrade to lithium, this is a budget-friendly drop-in replacement. It’s fine for light-duty mowing or trimming, but expect shorter runtime and heavier weight compared to lithium. Not ideal for heavy users or cold-weather operation.