CRAFTSMAN V20 4Ah Lithium Ion Power Tool Battery 2-Pack (CMCB204-2)

What It Is

This is a two-pack of Craftsman V20 4Ah lithium-ion batteries (model CMCB204-2) designed to power all tools in the Craftsman V20 cordless platform, including lawn mowers, trimmers, blowers, and edgers. It provides extended runtime for medium-duty yard work without needing a charger swap.

Fitment & Compatibility

• Platform: Works exclusively with Craftsman V20 tools (not V20* or 20V MAX from other brands).
• Mower fit: Fits all Craftsman V20 walk-behind mowers (e.g., CMCSP110M1, CMCMW220M1). Check your mower’s battery slot—some older models require a single battery, but this 2-pack lets you run two for longer cut times.
• Other tools: Compatible with V20 string trimmers, blowers, chainsaws, and hedge trimmers.
• OEM vs aftermarket: This is an authentic Craftsman OEM battery. Aftermarket “compatible” batteries often lack overcharge protection or may not fit snugly.
• Measurements: Each battery is 4.8” x 3.0” x 2.5” and weighs 1.2 lbs. Verify your tool’s battery compartment depth (most V20 tools accept this size).
• Charger: Works with any Craftsman V20 charger (sold separately or included with tool kits). Does not fit 19.2V or older Craftsman systems.

Key Things to Know

• Runtime: 4Ah gives roughly 30-45 minutes of mowing on a 20” deck (depending on grass height and speed). Two batteries can cover a ¼-acre lawn.
• Installation: Tool-free—slide into the battery port until it clicks. No tools or adapters needed.
• Quality: Lithium-ion cells with built-in LED fuel gauge (press button to check charge). Rated for 300+ charge cycles.
• Gotcha: Batteries are not interchangeable with Craftsman’s 60V or 19.2V lines. Also, the 2-pack does not include a charger—you’ll need one if you don’t already own a V20 charger.
• Storage: Keep at room temperature (40-80°F). Extreme cold reduces runtime; extreme heat shortens lifespan.

Should You Buy It

Yes, if you already own Craftsman V20 tools and need reliable, long-lasting power for medium-sized yards. The 4Ah capacity is a sweet spot—enough for mowing without the weight of a 6Ah pack. Skip if you only have one V20 tool or if your mower requires a single battery (the 2-pack is overkill). For $79, it’s a solid value versus buying two singles ($99+).