DeWalt 20V MAX 6.0Ah and 4.0Ah Battery (2-Pack)

What you get and how I used it

This 20V MAX 6.0/4.0Ah two-pack is a straightforward bundle: two lithium-ion batteries with a 3-LED fuel gauge, no charger in the box. I ran the pair through several weeks of jobsite and yard work on common 20V MAX tools—impact driver, compact drill, reciprocating saw, small circular saw, oscillating multi-tool, and a pole saw. The idea was simple: treat the 6.0Ah as the “high-draw” battery and the 4.0Ah as the “everyday/overhead” pack, then swap as needed. That division ended up making a lot of sense.

Runtime and performance

The 6.0Ah pack is the star for anything that asks a lot from the motor. On a reciprocating saw cutting dimensional lumber (pressure-treated 2x4s and a handful of 2x6s), the 6.0Ah gave me about 45–55 quick cuts before voltage sag pushed me to swap. Doing demolition with mixed nails and screws drops that number a bit, but it still outpaced the 4.0Ah by a comfortable margin.

On an impact driver sinking 3-inch deck screws into southern yellow pine, the 6.0Ah delivered roughly 350–400 screws per charge with a moderate pace and occasional pre-drilling. The 4.0Ah landed around 250–300 screws under similar conditions. With the oscillating multi-tool (mostly plunge cuts in drywall and a few door jamb undercuts), both packs felt almost overqualified; the 4.0Ah handled a full afternoon of fits and starts.

Yard work is a different kind of test. The pole saw loves capacity, and the 6.0Ah pack let me trim branches up to 5 inches for a solid 40–50 minutes of intermittent cutting. In that context, the 4.0Ah still did fine, but I noticed more frequent pauses to swap batteries once the heavier cuts started stacking up. If you run a grinder, a compact circular saw, or a blower on this platform, the 6.0Ah is the one you’ll want loaded.

There’s nothing exotic about the discharge behavior—no surprises or dramatic falloff. The 3-LED gauge is basic but reliable. I treat one LED as “finish your current task and swap soon,” which proved accurate.

Charging and battery management

I primarily charged on a standard multi-voltage DeWalt charger (the common DCB115). From empty, the 4.0Ah consistently returned to full in about 50–55 minutes. The 6.0Ah took closer to 80–85 minutes. On DeWalt’s fast charger (the one designed to push more current), the 6.0Ah came back in right around an hour in my shop conditions.

That means you can keep a one-on, one-off rhythm with light-to-moderate duty, but for sustained high-draw work, I’d add a third battery or step up to a fast charger. The packs themselves have no memory effect and, in my experience, excellent self-discharge characteristics. I left the 4.0Ah sitting for almost two months and it dropped a single LED; the 6.0Ah held two LEDs over a similar period. If you don’t use a set daily, that low self-discharge is a real convenience.

Size, weight, and balance

Capacity has a cost in ounces, and you feel it. The 6.0Ah adds noticeable tail weight to compact tools and changes balance on a drill or impact driver—less of an issue at chest height, more noticeable overhead or when you’re reaching. I preferred the 4.0Ah on anything above shoulder level and anytime I needed precision (pilot holes, cabinet hardware, light-duty fastening). Conversely, for reciprocating saws, circular saws, and grinders, the 6.0Ah’s mass actually helps stabilize the tool.

The 4.0Ah is a good middle ground. It’s not as light as a 2.0Ah compact, but it stretches runtime without straining your wrist. If you’re building out a kit for finish work or installing fasteners all day, the 4.0Ah becomes the default. For production cutting, demo, or yard tasks, reach for the 6.0Ah.

Durability and cold-weather behavior

These packs took typical jobsite abuse: fine dust, truck-bed rides, a couple of unplanned drops from waist height onto plywood. The housings scuffed but stayed intact, the rails remained solid, and connection to every 20V MAX tool I tried was tight with no rattle. The fuel-gauge buttons remained responsive even after collecting dust; a quick blow-off restored them to normal clickiness.

Cold weather performance matched what I expect from quality lithium-ion. In the mid-30s Fahrenheit, both packs lost a slice of runtime, and the first few seconds of a heavy cut felt a bit sluggish until the cells warmed under load. Once warm, power delivery stabilized. That’s normal behavior and not unique here. I wouldn’t store them in freezing temps if I have a choice; bringing them up to room temperature before charging remains best practice.

Compatibility and platform fit

If you’re already in the 20V MAX world, these drop right in. I ran them on brushed and brushless models across the line without any oddities. The packs’ electronics played nice with tool-level protections; I had one thermal shutdown during a run of aggressive metal cutting with the reciprocating saw and a bi-metal blade. After a short cool-down, the pack resumed without issue.

One small note: DeWalt has a lot of model variants and bundles for batteries. This particular two-pack is battery-only. If you need a charger, confirm you’re picking a kit that explicitly includes one. It sounds obvious, but it’s easy to grab a look-alike package and realize you’ve got extra batteries but no way to top them off.

What could be better

• The 3-LED fuel gauge is serviceable, but a four or five-segment indicator would make it easier to forecast swap timing on long cuts or all-day installs.
• Weight is weight. That’s not a flaw of this pack so much as physics, but if you lean on compact tools for overhead work, you may still want a 2.0Ah or 3.0Ah compact in your rotation.
• Packaging clarity across DeWalt’s battery lineup could be improved for quick at-a-glance differences (amp-hour, form factor, and whether a charger is included).

None of these are dealbreakers; they’re considerations that help you pick the right mix of packs for your work.

Who benefits most

• Remodelers, carpenters, and DIYers who bounce between fastening and cutting. Use the 4.0Ah on drivers and drills, keep the 6.0Ah ready for saws and grinders.
• Yard and property maintenance users running pole saws, hedge trimmers, and blowers. The 6.0Ah noticeably extends session time.
• Anyone building a two-battery workflow on a standard charger. The 4.0Ah/6.0Ah cadence works well if you rotate with a reasonable pace.

If you run high-demand tools continuously—like an angle grinder for metalwork—you’ll still benefit from a third battery or a fast charger to avoid downtime.

Warranty and value

The coverage is what I expect from DeWalt: a 3-year limited warranty, one year of free service, and a 90-day satisfaction guarantee. It’s a solid safety net for something you’ll likely cycle hard. As for value, the mixed-capacity pairing is smarter than two of the same for many users. You get a lighter option for control and a heavier hitter for runtime, and you can tailor which one rides with which tool. If you need two identical packs for workflow reasons, that’s a different shopping decision—but for most, this mix is practical.

Recommendation

I recommend this two-pack. The combination of a 6.0Ah and a 4.0Ah covers a wide swath of tasks without forcing you to choose between runtime and ergonomics. In use, both packs delivered predictable power, charged in reasonable times on standard and fast chargers, and held up to typical jobsite abuse. The 3-LED gauge is basic, and the 6.0Ah is no one’s idea of “light,” but those trade-offs are easy to live with when the platform compatibility is broad and the warranty is strong. If you’re on 20V MAX and want a simple, versatile battery foundation, this pair makes a lot of sense.