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The Craftsman CMCB204 is a 20-volt lithium-ion battery pack rated at 4.0 Ah, part of the V20 cordless system. It fits the full line of Craftsman V20 drills, drivers, saws, trimmers and other tools that share the same battery interface. The 4.0 Ah capacity sits in the middle of the V20 range: more runtime than the compact 1.5 and 2.0 Ah packs, less than the larger 5.0 Ah and higher packs, at a weight most people can handle in a drill or impact driver. Owners of V20 tools buy it as a spare or replacement; it is not a fit for other brands' tools.
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Owners of Craftsman V20 tools generally treat the 4.0 Ah pack as a dependable spare that lasts longer than the compact batteries shipped in kits. Complaints center on the brand-locked fit and on runtime falling short of the bigger packs for heavy saw and trimmer work.
New Craftsman CMCB204 V20 20-Volt Lithium-ion 4.0 Ah Battery
