Which is better for drilling concrete?

The DCD805B, on paper. It hits 34,000 BPM against 28,050 BPM on the DCD798B, and both take bits up to 1/2 in. Neither is a substitute for a corded rotary hammer on deep holes.

Which is more compact?

Nearly the same. The DCD798B lists a 6.93 in head length and the DCD805B lists 6-15/16 in, a difference of about 1/16 in. The DCD805B is lighter at 2.3 lbs versus 2.49 lbs.

Is the DCD805B worth the savings?

Yes if you want speed and price. At $52.99 at eBay versus $71.89 at eBay as of November 4, 2026, it is about $19 cheaper and faster. The DCD798B's edge is its 15 clutch settings for controlled screw driving.

Do either include a battery?

No. Both are tool-only listings, so you need a 20V MAX battery and charger. DEWALT recommends the DCB205 or DCBP034 pack for the DCD805B.

Both use brushless motors and neither maker publishes a life rating, so there is no clear winner. Battery care and duty cycle matter more than the model choice.

Why is the DCD805B so cheap at eBay?

Some eBay buyers report counterfeit units, used tools sold as new, and batteries that will not lock in. Check the seller and return policy before buying at that price.

DEWALT 20V MAX Brushless 1/2 in Hammer Drill (DCD798B) vs Dewalt DCD805B 20V Compact Cordless 1/2" Brushless Hammer Drill (Tool Only)

Both are 20V MAX brushless hammer drills sold as bare tools, and the DCD805B is the newer, faster design: 2,000 RPM and 34,000 BPM versus 1,650 RPM and 28,050 BPM on the DCD798B. The DCD798B is the shorter, lighter tool at 6.93 in and 2.49 lbs, which matters between studs and overhead. Price flips the decision: $52.99 at eBay for the DCD805B versus $71.89 at eBay for the DCD798B as of November 4, 2026. Buy the DCD805B for speed and value, the DCD798B for the most compact body.

Today the Dewalt DCD805B 20V Compact Cordless 1/2" Brushless Hammer Drill (Tool Only) costs $18.90 less at its best price.

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