Wild Badger Power 40V 21" Cordless Lawn Mower Brushless, 6,534 sq ft/0.15 ac, 2×4.0Ah Batteries & Fast Charger, 7-Position Heights,for Medium-to-Large Lawns

What It Is

This is a complete battery-and-charger kit for the Wild Badger Power 40V cordless lawn mower system. It includes two 4.0Ah lithium-ion batteries and a fast charger, designed to power 40V Wild Badger mowers (and compatible tools) for medium-to-large lawns up to 6,534 sq ft.

Fitment & Compatibility

• Exact fit for Wild Badger Power 40V 21" brushless mower (model WB40VLM21).
• Not cross-compatible with other brands (Greenworks, Kobalt, etc.)—uses proprietary slide-in battery pack.
• Voltage specific: Only 40V Wild Badger tools; will not work with 20V or 80V lines.
• Check your mower deck: This kit fits 21" decks only. Do not use on smaller or larger mowers.
• OEM replacement: Genuine Wild Badger part—no aftermarket alternatives available.
• Battery dimensions: 6.5" long, 3.5" wide, 2.5" tall—fits existing battery bay without modification.

Key Things to Know

• Installation is trivial: Slide batteries into mower until they click; charger plugs into standard 120V outlet. No tools required.
• Run time: Two 4.0Ah batteries cover ~6,500 sq ft on a single charge (mixed grass conditions). Expect ~45 minutes per battery.
• Charge time: Fast charger fills a depleted battery in about 90 minutes.
• Gotcha: Batteries are heavy (3.2 lbs each). If your mower feels unbalanced, try using one battery at a time on smaller lawns.
• Storage warning: Keep batteries above freezing; cold reduces run time by 20-30%.
• Quality note: 4.2-star rating from 1,000+ reviews—reliable but some users report shorter-than-expected lifespan (2-3 seasons with heavy use).

Should You Buy It

If you already own a Wild Badger 40V 21" mower and need a spare set of batteries or a replacement for worn-out packs, this kit is the only OEM option and works as advertised. It’s also a solid choice for first-time buyers who want the full 2-battery setup for larger lawns. Skip it if you need interchangeable batteries with other brands or if your lawn is under 3,000 sq ft—a single battery kit will save you money.