Owning ordinary DeWalt 20V MAX batteries does not mean you can power a 60V MAX FlexVolt saw. The DCS578 requires a compatible 20V/60V MAX FlexVolt battery. That is the first correction to make before treating an existing DeWalt tool collection as a reason to buy it.
FlexVolt refers to a battery system used by several tools. This review focuses on the DCS578 circular saw, using the DCS578X1 kit as the documented purchase example. We have not tested its cuts, runtime or handling against a corded saw.
Bare tool and kit are different purchases
DeWalt’s DCS578X1 listing includes a DCB609 FlexVolt battery, charger and bag. The DCS578B is a bare-tool option. Confirm the full suffix and contents rather than assuming a pictured battery is included.
The 60V MAX system information explains the dual-voltage battery platform. Compatibility is not reversible simply because a FlexVolt pack can also serve supported 20V MAX tools. Use approved packs and chargers; do not use an adapter to defeat the saw’s battery requirements.
Cutting features to match to the job
The manufacturer lists a 7-1/4-inch blade, 2-9/16-inch maximum cut depth at 90 degrees, bevel capacity to 57 degrees and an electronic brake. Check the capacity at the actual angle needed; the deepest square cut does not apply at every bevel.
Select a blade approved for the saw and the material. A wood-cutting configuration is not automatically suitable for masonry or metal, and a high no-load speed is not evidence of a better finished edge in every material.
What changes the buying decision?
| Your work | Comparison worth making |
|---|---|
| Repeated cuts away from outlets | Complete FlexVolt kit, spare-pack needs and charging access |
| Work mainly at a powered bench | A suitable corded saw with comparable cutting capacity |
| Smaller cuts and lower carrying weight are priorities | An appropriately sized cordless saw, rather than assuming the larger platform is necessary |
| Existing DeWalt tools | Exact pack and charger compatibility, not just logo matching |
Handling still matters
Support the work to avoid blade binding, use the guards as intended and follow kickback precautions. An electronic brake does not prevent kickback or make it safe to touch a blade immediately after releasing the trigger. Remove the battery for blade changes and adjustments as instructed.
Verdict
Consider the DCS578 when its capacity and cordless use justify the complete system cost. Compare the actual package cost, required cuts and handling requirements with a suitable corded option.
Sources checked 19 September 2026. The Amazon link searches the named kit; verify included battery and seller terms.