Is the 4.0Ah worth $18 more than the 2.0Ah?

Yes if you use saws, grinders or sanders, where the extra capacity roughly doubles runtime. For drills and drivers only, the 2.0Ah is enough and saves money.

Which lasts longer per charge?

The 4.0Ah, at about twice the capacity. Expect roughly double the runtime in the same tool.

Do both fit the same tools and chargers?

Yes. Both are Craftsman V20 packs and work with V20 tools and the V20 chargers, including the CMCB104 fast charger.

Which is better for a drill or impact driver?

The 2.0Ah. It is lighter at 0.27 lb and keeps the tool balanced, and a drill does not need 4.0Ah of runtime.

Which charges faster?

The 2.0Ah, at about 0.5 hours on the fast charger versus about 1 hour for the 4.0Ah.

Does the 4.0Ah come with a warranty?

Yes, a 3-year limited warranty. The 2.0Ah listing does not state one.

Craftsman V20 20V MAX Lithium-Ion 2.0Ah Battery Pack vs Craftsman V20 20V MAX Lithium-Ion 4.0Ah Battery Pack

Buy the 4.0Ah pack if you run high-draw tools like circular saws or grinders, or want fewer battery swaps. Buy the 2.0Ah pack if you want the lightest battery for drills and drivers, or the lowest entry price. As of November 4, 2026, the 2.0Ah is $32.00 at eBay and the 4.0Ah is $50.00 at Amazon, an $18 gap.

Today the Craftsman V20 20V MAX Lithium-Ion 2.0Ah Battery Pack costs $18.00 less at its best price.

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