Framing carpenters have been skeptical of cordless circular saws since the first underpowered 18V models hit the market a decade ago. Both of these saws have changed that conversation. The DeWalt DCS577 runs on 60V FLEXVOLT and uses a 7-1/4-inch blade at full worm-drive geometry. The Milwaukee 2830-20 uses M18 at 7-1/4 inches in a rear-handle configuration that mimics the feel of a Skilsaw. If you've been waiting for a cordless circular saw that doesn't make you miss the cord, one of these might finally do it.
DeWalt DCS577B (FLEXVOLT 60V)
The DeWalt DCS577 delivers more sustained power at 60V; the Milwaukee 2830-20 is the better choice for M18 platform users and anyone who prefers rear-handle ergonomics.
Specs Comparison
| Spec | DeWalt DCS577B (FLEXVOLT 60V) | Milwaukee M18 FUEL Rear Handle 2830-20 |
|---|---|---|
| Blade Size | 7-1/4 in | 7-1/4 in |
| No-Load RPM | 5,800 | 5,800 |
| Cutting Depth (90°) | 2-9/16 in | 2-1/2 in |
| Battery Voltage | 60V FLEXVOLT | 18V M18 |
| Handle Style | Rear-handle | Rear-handle |
| Warranty | 3-year | 5-year |
| Tool-Only Price | ~$209 | ~$219 |
Blade Size, RPM, and Cutting Capacity
Both saws run 7-1/4-inch blades — the framing standard. The DeWalt DCS577 at 60V FLEXVOLT runs 5,800 RPM no-load with a 2-9/16-inch cutting depth at 90 degrees. That depth is sufficient for doubled 2x framing members and all standard dimensional lumber. The high-voltage platform allows the motor to maintain blade speed under the load of cutting pressure-treated 2x6 ripping cuts that would bog an 18V saw significantly.
The Milwaukee 2830-20 at M18 (18V nominal) runs 5,800 RPM no-load and 2-1/2-inch cutting depth — essentially identical specs on paper to the DeWalt. In practice, FLEXVOLT's higher voltage provides a meaningful advantage in sustained, high-load cuts: ripping 3/4-inch plywood from end to end, cutting through LVL, or making repetitive framing cuts in rapid succession.
For occasional cuts in standard framing lumber, the Milwaukee 2830-20 performs as well as the DeWalt. For sustained heavy cutting through the working day, the 60V advantage becomes tangible as motor temperatures climb and lower-voltage tools throttle back to protect themselves.
Rear-Handle Ergonomics and Worm-Drive Geometry
The Milwaukee 2830-20's rear-handle layout mirrors a traditional worm-drive saw geometry — the handle sits directly behind the blade rather than above it, giving the operator a natural pushing motion. Framing carpenters who trained on Skilsaw worm drives or Porter-Cable hypoid saws will find this geometry immediately comfortable.
The DeWalt DCS577 also uses a rear-handle configuration — a departure from earlier FLEXVOLT circular saw designs that used a standard sidewinder layout. Both saws now compete on similar ergonomic ground, which narrows the feel differentiation considerably.
Blade-left configuration on the DCS577 puts the blade on the operator's right side when right-handed — preferred by many framers for sightline clarity on cut marks. The Milwaukee 2830-20 is also blade-left. Both accept standard Diablo and Irwin framing blades without modification.
Battery Platform and Runtime
The DeWalt DCS577B requires a 60V FLEXVOLT battery. These packs are physically the same as 20V MAX batteries but electronically switch between 20V and 60V depending on the tool. A 6.0Ah FLEXVOLT pack ($129-149 street) gives you roughly 400-500 cuts in 2x framing lumber per charge — enough for a serious half-day of framing work without a swap.
The Milwaukee 2830-20 on an M18 HIGH OUTPUT 12.0Ah pack gets comparable runtime but requires a significantly heavier pack. The M18 HO 12.0Ah ($169-189) is a large, heavy battery that shifts the tool's balance. For a stationary miter saw that balance shift is invisible; for a circular saw you're carrying and maneuvering all day, it's noticeable.
FLEXVOLT's cross-compatibility is the DeWalt ecosystem's strongest selling point: the same 60V FLEXVOLT packs run in the DCS577, the 60V table saw, the 60V router, and can step down to run any 20V MAX tool. That single-battery architecture across voltage ranges is an advantage Milwaukee cannot match — M18 is 18V only, with no 36V or higher tier.
Price, Warranty, and Total Cost
The DCS577B tool-only runs $199-219. Add a 6.0Ah FLEXVOLT battery ($139) and charger ($49) and you're at $387-407 all-in to get started. The Milwaukee 2830-20 tool-only is $199-229; a comparable M18 HO 8.0Ah pack ($129) and charger puts the entry cost at $357-407 — roughly even.
Milwaukee's 5-year warranty applies to the 2830-20. DeWalt offers 3-year on the DCS577. For a saw used daily on framing sites, that two-year gap is meaningful warranty exposure.
Both saws represent a real investment in cordless framing. Neither is a budget product. If your saw budget is under $300 all-in, a corded Skilsaw SOUTHPAW or WORM DRIVE is still the better bang per cut and will outlast either cordless option with less fuss.
DeWalt DCS577B (FLEXVOLT 60V) Strengths
- 60V FLEXVOLT sustained power advantage in heavy load cuts and ripping
- FLEXVOLT packs cross-compatible with entire 20V MAX tool ecosystem
- Blade-left, rear-handle geometry comfortable for framing carpenters
- ~$199-219 tool-only — competitive entry pricing
Milwaukee M18 FUEL Rear Handle 2830-20 Strengths
- Rear-handle worm-drive ergonomics preferred by framers trained on Skilsaw
- M18 platform — runs same packs as Milwaukee drills, saws, and impact drivers
- 5-year tool warranty vs DeWalt's 3-year
- POWERSTATE motor maintains speed under load comparably to 60V on light-to-moderate cuts
DeWalt DCS577B (FLEXVOLT 60V) Weaknesses
- Requires separate FLEXVOLT battery — can't use standard 20V MAX compact packs
- 3-year warranty vs Milwaukee's 5-year
- 60V FLEXVOLT packs are heavier than M18 equivalent Ah packs
Milwaukee M18 FUEL Rear Handle 2830-20 Weaknesses
- 18V platform throttles under sustained heavy-load ripping more than 60V
- High-capacity M18 packs (required for runtime parity) are heavy and shift balance
- No cross-voltage architecture — M18 tops out at 18V
Best For
- DeWalt DCS577B (FLEXVOLT 60V) Framers who do heavy, sustained cutting all day and want the platform flexibility of FLEXVOLT across voltage tiers
- Milwaukee M18 FUEL Rear Handle 2830-20 M18 platform users and framers who prefer traditional worm-drive ergonomics and value the 5-year warranty
FAQ
Can I use a 20V MAX battery in the DeWalt DCS577?
Yes — physically, the 20V MAX pack seats in the DCS577. But the saw operates in 20V mode with significantly reduced power output. For serious cutting performance, the DCS577 needs a FLEXVOLT pack. Using a standard 20V MAX pack in a 60V tool is a misuse case that delivers neither the performance you want nor the battery longevity you'd expect.
Are these saws a real replacement for a corded saw on a framing crew?
For most framing tasks: yes. For all-day ripping of pressure-treated 2x10s or cutting through stacks of 3/4-inch plywood without a charging break, you need multiple batteries staged and charging. A four-battery rotation handles a full day's framing. Some trim carpenters and framers still keep a corded saw as a backup for marathon cutting sessions, which is a reasonable hedge.