Our take on the Craftsman 20V 4.0-Ah Lithium-Ion Battery

The Craftsman 20V 4.0-Ah Lithium-Ion Battery is a spare or replacement pack for the brand's V20 cordless lineup, which covers drills, impact drivers, saws, trimmers and blowers. Its 4.0 Ah capacity sits in the middle of the range: double the runtime of the compact 2.0 Ah packs, half that of the 6.0 Ah and larger packs, at a weight that keeps a drill or driver balanced. It suits owners already in the V20 system who want longer runs without the bulk of a high-capacity pack. Against third-party and generic packs, the appeal is guaranteed fit and the brand's warranty; against the bigger packs, it trades runtime for lighter weight.

Best forOwners already in the Craftsman V20 tool systemLonger jobs than a compact 2.0 Ah pack allowsKeeping a drill or impact driver balancedA spare pack to rotate while one charges

Pros

4.0 Ah capacity gives roughly double the runtime of a 2.0 Ah pack
Fits the full range of Craftsman 20V tools and chargers
Lighter and less bulky than 6.0 Ah and larger packs
Lithium-ion holds charge in storage better than older chemistries
Genuine pack, so fit and warranty are straightforward

Questions and answers

Will this battery fit any Craftsman 20V tool?

It is part of the Craftsman V20 system, so it fits the brand's 20V drills, drivers, saws, trimmers and blowers and charges on the matching V20 chargers. It does not fit older Craftsman 19.2V tools or other brands.

How does 4.0 Ah compare with the 2.0 Ah and 6.0 Ah packs?

Runtime scales with capacity, so expect about twice the run time of a 2.0 Ah pack and about two-thirds of a 6.0 Ah pack. The 4.0 Ah is the middle choice: more work per charge than the compact pack, less weight than the big one.

Is it worth it over a cheaper third-party battery?

A genuine pack guarantees fit, correct charging and the brand's warranty, which generic packs often lack. Third-party packs can work, but reports of early failures and charger mismatches are common.

Does it work with the Craftsman V20 charger I already have?

Yes. It uses the same V20 slide-on connection as the other packs in the line, so the standard V20 charger that came with your tools will charge it.

How should I store it when not in use?

Keep it out of direct sun and away from freezing temperatures, and store it partly charged rather than fully drained. Lithium-ion packs lose charge slowly in storage, so top it up before a long break.

Craftsman 20V 4.0-Ah Lithium-Ion Battery

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Our take on the Craftsman 20V 4.0-Ah Lithium-Ion Battery

Best forOwners already in the Craftsman V20 tool systemLonger jobs than a compact 2.0 Ah pack allowsKeeping a drill or impact driver balancedA spare pack to rotate while one charges

Pros

4.0 Ah capacity gives roughly double the runtime of a 2.0 Ah pack
Fits the full range of Craftsman 20V tools and chargers
Lighter and less bulky than 6.0 Ah and larger packs
Lithium-ion holds charge in storage better than older chemistries
Genuine pack, so fit and warranty are straightforward

Craftsman 20V 4.0-Ah Lithium-Ion Battery prices at every store

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About the Craftsman 20V 4.0-Ah Lithium-Ion Battery

This is a 20V lithium-ion battery with a 4.0-Ah capacity. It is designed for Craftsman power tools and is built to provide extended runtime.

Brand: Craftsman
Voltage: 20V
Capacity: 4.0 Ah
Battery type: Lithium-ion
Compatibility: Craftsman power tools

Questions and answers

Will this battery fit any Craftsman 20V tool?: It is part of the Craftsman V20 system, so it fits the brand's 20V drills, drivers, saws, trimmers and blowers and charges on the matching V20 chargers. It does not fit older Craftsman 19.2V tools or other brands.
How does 4.0 Ah compare with the 2.0 Ah and 6.0 Ah packs?: Runtime scales with capacity, so expect about twice the run time of a 2.0 Ah pack and about two-thirds of a 6.0 Ah pack. The 4.0 Ah is the middle choice: more work per charge than the compact pack, less weight than the big one.
Is it worth it over a cheaper third-party battery?: A genuine pack guarantees fit, correct charging and the brand's warranty, which generic packs often lack. Third-party packs can work, but reports of early failures and charger mismatches are common.
Does it work with the Craftsman V20 charger I already have?: Yes. It uses the same V20 slide-on connection as the other packs in the line, so the standard V20 charger that came with your tools will charge it.
How should I store it when not in use?: Keep it out of direct sun and away from freezing temperatures, and store it partly charged rather than fully drained. Lithium-ion packs lose charge slowly in storage, so top it up before a long break.