Which is better for driving lag screws and deck screws?

The DCF845P1. Its 1,825 in-lbs beats the other driver's roughly 1,814 in-lbs, and owners report it handles lag screws without bogging down.

Which has longer runtime?

The starter kit ships with two packs, so you can swap and keep working. The DCF845P1's single 5.0 Ah battery is rated for a full day of framing or rough-in by owners.

Is the DCF845P1 worth the extra money?

At $136.99 at eBay as of November 3, 2026, it is the only one of the two with a stated price, and it adds more torque and a 3-year warranty. The starter kit only wins if you need two batteries.

Do both use the same 20V MAX batteries?

Yes. Both are DeWalt 20V MAX tools, so packs and chargers are interchangeable across the platform.

Which is lighter for overhead work?

The DCF845P1. It is described as compact enough to run one-handed in tight stud bays, while the starter kit is listed at 7.35 lbs.

Which has better speed control for trim and cabinet work?

Both have 3-speed settings and a variable trigger. The DCF845P1's low setting is widely praised for not stripping cabinet hardware.

DeWalt 20V MAX XR Brushless 1/4 in. Impact Driver Kit (DCF845P1) vs DeWalt 20V MAX XR Lithium-Ion Cordless Impact Driver with 6.0 Ah and 4.0 Ah Starter Kit

Both are DeWalt 20V MAX XR brushless impact drivers with 3-speed control and 4,200 IPM. The DCF845P1 kit is the better buy for most shoppers: it has more torque (1,825 in-lbs vs 205 Nm, about 1,814 in-lbs), a 5.0 Ah battery, and a 3-year limited warranty, at $136.99 at eBay as of November 3, 2026. The 6.0 Ah and 4.0 Ah starter kit gives you two batteries but lower rated torque and a heavier 7.35 lb package.

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