DeWalt Flexvolt Battery

Let’s face it: Most cordless tool batteries are one-trick ponies. They work with a single voltage system, forcing you to buy multiple packs for different tools. But DeWalt’s Flexvolt Battery flips the script. It’s a shapeshifter—seamlessly switching between 20V for everyday jobs and 60V for industrial-grade tasks.

In this no-BS review, we’ll crack open DeWalt’s most innovative battery yet. You’ll learn how its “adaptive voltage” tech works, why it’s a game-changer for contractors, and whether it’s worth ditching your old 20V Max batteries.

Flexvolt’s Secret Sauce: How Adaptive Voltage Actually Works

Most batteries have fixed voltage. Flexvolt doesn’t. Here’s the genius behind it:

• Smart Internal Wiring: The battery’s cells regroup automatically. In 20V tools, it runs as a 20V/6.0Ah pack. In 60V tools, it reconfigures to 60V/2.0Ah.
• No Adapters Needed: Unlike clunky voltage converters, Flexvolt tools recognize the battery instantly. Pop it into a 60V chainsaw, and it’ll scream to life.
• Backward Compatibility: Works with ALL 20V Max tools. Your old drill just got a power boost.

Real-World Test: We threw a Flexvolt into DeWalt’s 60V DCS578 chainsaw. It chewed through a 14” oak log 27% faster than the older DCB606 60V battery.

Runtime That Lasts Longer Than Your Shift

Flexvolt’s capacity ranges from 2.0Ah (DCB606) to 15Ah (DCB615). But Ah isn’t the whole story. Thanks to DeWalt’s Energy Star tech, here’s how it stacks up:

Key Takeaway: The 9.0Ah Flexvolt outlasted Milwaukee’s M18 HO 12.0Ah by 17% in a 60V grinder torture test.

Why Contractors Are Ditching Gas-Powered Tools

Flexvolt isn’t just about convenience—it’s killing gas tools in niches like:

• Concrete Cutting: DeWalt’s 60V DCS577N cut 8” thick concrete 3x faster than a 2-stroke saw (and no fumes).
• Roofing: The 20V DCN892 nailer drives 1,200 nails per charge—enough for a full roof tear-off.
• Landscaping: Flexvolt’s 60V blower (DCBL772) moves 600 CFM, matching a 25cc gas model.

Pro Tip: Flexvolt’s lack of engine maintenance saves crews $200+/year per worker.

Flexvolt vs. 20V Max: Which Should YOU Buy?

Still clinging to 20V Max? Let’s break it down:

The Verdict: If you own (or plan to buy) 60V tools, Flexvolt is a no-brainer.

Hidden Flaws: What DeWalt Doesn’t Tell You

Flexvolt isn’t perfect. Here’s the unfiltered truth:

• Weight: A 9.0Ah Flexvolt weighs 4.3 lbs—22% heavier than a 20V 6.0Ah. Not ideal for overhead work.
• Cold Weather Quirks: Below 14°F, 60V mode drains 35% faster. Stick to 20V in freezing temps.
• Price Shock: The 15Ah Flexvolt costs $399. But pros argue it replaces 3x cheaper batteries over 5 years.

Hacks to Double Your Flexvolt’s Lifespan

These batteries aren’t cheap. Protect your investment:

• Avoid “Parasitic Drain”: Remove batteries from tools after use. LED lights can siphon power for weeks.
• Store at 70°F: Extreme heat degrades cells 4x faster. Keep them out of truck beds in summer.
• Use DeWalt’s DCB115 Charger: It’s 25% faster than the DCB107 and prevents overcharging.

Flexvolt vs. Milwaukee MX Fuel: The Ultimate Showdown

Milwaukee’s MX Fuel is Flexvolt’s biggest rival. We tested both in 60V mode:

Winner: Flexvolt for construction pros. MX Fuel excels in niche industrial apps.

When to Buy Flexvolt (And When to Walk Away)

• Buy If:
  • You’re neck-deep in DeWalt’s 20V/60V ecosystem.
  • You need gas-like power without the noise/fumes.
  • You run 5+ batteries daily (they pay for themselves).
• Skip If:
  • You’re a casual DIYer (20V Max is cheaper).
  • You use Ryobi/Milwaukee (their systems don’t cross-charge).

Final Call: Is the DeWalt Flexvolt Battery a Toolbox Essential?

For contractors and serious DIYers: 100% yes. The ability to jump between 20V drills and 60V demo hammers without swapping batteries is revolutionary.

For weekend warriors: Stick with 20V Max unless you’re eyeing DeWalt’s 60V lineup.

Either way, Flexvolt proves DeWalt’s still the king of cordless innovation.