So is brushless better than the regular DW drill??

Yes. First off, it is more efficient than brush-ed. When you run it with a light load, it draws less power. Dewalt says you get up to 30% more runtime from the same charge. The better efficiency is a fact, and the 30% is possibly conservative. There is a youtube video of a guy drilling 1/2" holes into a board with a brushless and a traditional dewalt drill, and the brushless wins 2 to 1. it drills some 190 holes vs the brushed just 92. The second advantage: there are no brushes to wear out and replace. TBT I have many brush-ed tools and as a DIY-er I never had to replace the brushes on any of them, but this may be an advantage to a pro or heavy user. A third advantage, the tool can be built more compact, or more powerful (given the same size)The only advantage of the "brush equipped" design:that it is simpler. The brushless changes the direction of the Dc current using electronics instead of a mechanical commutator, so that is an extra source of possible failure

Why do two Lithium ion batteries go for $170. and the kit with two batteries a charger the carry case and the drill go for $97.00

Unfortunately, nowhere on the box am I able to find amp hours and when asking Lowes employees they said it was 20 volts. I had to explain that I am needing to know amp hours. It took me awhile to find online that the batteries in this kit are 1.3 Ah. Even in this Amazon ad the only place I have found it mentioned is in the questions. The batteries that were 2 for $99 at Lowes were 3Ah.

How long does battery last

Batteries that come with unit are small but very light, excellent for my usage. DeWalt sells these 20v packs in 3 different capacities these are the smallest ones. How long they last is a HUGE variable based on what the task is so that will be impossible to determine for someone else. In my experience these small ones last about the same as the 18v Ni-Cad Dewalt system (18 yrs old) I replaced with this set.

Brand	DEWALT
Power Source	Battery Powered
Maximum Rotational Speed	1.5E+3 RPM
Voltage	20
Amperage	2 Amps
Maximum Chuck Size	0.5 Inches
Color	Yellow
Included Components	Battery Charger
Special Feature	Compact, Lightweight
Product Dimensions	12.5"L x 3.75"W x 9.81"H
Material	Blend
Maximum Torque	53.1 Newton Meters
Number of Speeds	2
Speed	1500 RPM
Item Weight	5.11 Pounds
Maximum Power	3E+2 Watts
Item Torque	53.1 Newton Meters
Drill Type	Basic Drill
Battery Capacity	2 Amp Hours
Is Electric	Yes
UPC	885911919210
Drilling Capacity Wood	0.5 Inches
Manufacturer	DEWALT
Drilling Capacity Metal	0.5 Inches
Part Number	DCD777D1
Item Weight	5.11 pounds
Item model number	DCD777D1
Batteries	1 Lithium Ion batteries required. (included)
Style	New Battery
Finish	Brushed
Pattern	Solid
Shape	Rectangular
Item Package Quantity	1
Special Features	Compact, Lightweight
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Lithium Ion

DEWALT 20V MAX Cordless Drill Driver Set, Electric Drill, Brushless 1/2 In 2 Speed, 2.0 Ah Battery, Charger and Bag Included, LED Light (DCD777D1)

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