Which saw cuts deeper?

The FLEXVOLT 60V. It cuts 2-9/16 in. deep with a 7-1/4 in. blade, while a 6-1/2 in. saw tops out around 2-1/8 in. at 90 degrees.

Do I need a 60V battery for the DCS578B?

It is sold as a tool only, so you need a battery and charger. It runs on 60V FLEXVOLT packs and also accepts 20V MAX packs at lower output.

Is the 20V kit a better first saw?

For most homeowners, yes. It is lighter at 6.3 lb and includes a 6.0Ah battery, so there is nothing else to buy to start cutting.

Which is easier to handle all day?

The 20V 6-1/2 in. saw. At 6.3 lb it is about 2 lb lighter than the 8.2 lb FLEXVOLT bare tool, which matters for overhead and one-handed cuts.

Is the FLEXVOLT worth the extra money?

Only if you cut thick stock or already own 60V batteries. The tracked price ran $189.00 to $194.99, and that buys the bare tool, not a battery.

Can both saws share batteries?

Yes, if you own 20V MAX packs. The FLEXVOLT accepts them at reduced power, and the 20V saw uses them natively.

DeWalt FLEXVOLT 60V MAX 7-1/4 in. Circular Saw (DCS578B) vs DeWalt 20-Volt MAX Cordless Brushless 6-1/2 in. Circular Saw with 20-Volt Battery 6.0Ah

Buy the FLEXVOLT 60V (DCS578B) if you cut thick stock, rip 2x framing, or want one saw that handles full-depth 7-1/4 in. work. Buy the 20V MAX 6-1/2 in. kit if you want a lighter saw that arrives ready to run with a 6.0Ah battery. The FLEXVOLT is the tool only and runs $189.00 to $194.99 in the tracked price history, while the 20V kit's price was not provided here, so compare the kit's current store prices before deciding.

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