Corded vs. Cordless Power Tools: When the Cord Still Wins
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Battery technology has gotten good enough that cordless tools handle 90% of what most people need. But "90%" leaves a real gap, and that gap is where corded tools still earn their place. Sustained high-draw applications, all-day runtime without battery swaps, and raw power-per-dollar are the three areas where a cord beats a battery. This guide breaks down which tools are better cordless, which are better corded, and which ones depend entirely on how you use them.
Where Cordless Has Won
Drills, impact drivers, and oscillating multi-tools are cordless categories. The runtime demands are moderate (most tasks take minutes, not hours), the power requirements are well within what an 18V/20V battery delivers, and the portability of no cord is a significant workflow improvement. A cordless drill on a ladder, in a crawlspace, or across a job site is so much more convenient than managing an extension cord that the small power deficit is irrelevant.
Circular saws, reciprocating saws, and jigsaws have also crossed the cordless threshold for most users. Milwaukee's M18 FUEL circular saw and DeWalt's FLEXVOLT 60V MAX recip saw compete directly with their corded equivalents for intermittent cutting. A 5.0Ah battery handles a reasonable number of cuts before needing a swap. For framing, demolition, and general carpentry, cordless saws are now the default.
Where Corded Still Wins
Angle grinders are the clearest case. Grinding and cutting metal draws 8 to 15 amps continuously. A cordless grinder on a 5.0Ah battery lasts 15 to 25 minutes of continuous grinding. That's fine for occasional cuts. It's not fine for spending an afternoon cutting rebar or grinding welds. A corded grinder costs $40 to $80 and runs until you unplug it.
Routers, planers, and table saws are similar. These tools draw sustained high current under load, and the work sessions tend to be long. Running a router along 20 feet of edge profile, or planing a stack of rough lumber, or making 50 rip cuts on a table saw, all drain batteries fast. Corded versions cost less and don't force you to stop and recharge mid-task.
The Hybrid Approach
Most shops and serious DIYers end up with both. Cordless for the grab-and-go tools you reach for daily. Corded for the stationary or high-draw tools that live in the shop. There's no rule that says you have to pick one platform and commit. A cordless DeWalt drill and a corded Craftsman bench grinder coexist perfectly.
The one exception is if you're working on sites without power, which is common for remodeling, outdoor construction, and new builds before the electrical is live. In those cases, a generator plus corded tools, or an all-cordless kit with spare batteries, are your two options. The all-cordless route is simpler and quieter but costs more upfront in batteries.
Cost Comparison
A corded drill from Craftsman or Ryobi costs $35 to $50. A cordless drill with a battery and charger costs $100 to $180. The tool itself isn't much more expensive. You're paying for the battery, and that battery also powers your other cordless tools. So the cost comparison isn't fair on a per-tool basis. It's a platform investment.
Where corded saves real money: tools you only use in one location. A corded bench grinder at $60 does the same job as a cordless angle grinder at $150 plus batteries. A corded random orbit sander at $50 does the same job as a cordless one at $130. If the tool never leaves your workbench, the cord isn't a limitation and the savings are real.
Battery Math: Runtime in Practice
A 5.0Ah battery on a cordless circular saw makes roughly 200 crosscuts in 2x4 lumber before dying. That's enough for most framing sessions. But a 2.0Ah battery (the smaller, lighter option) makes about 80 cuts. Battery capacity directly determines how long you can work between charges.
Charge times range from 30 minutes (rapid chargers from Milwaukee and DeWalt) to 90 minutes (standard chargers). If you're working hard, two batteries on rotation keep you going. If you're doing sustained work like all-day sanding or grinding, the math tips back toward corded. Two batteries won't last 8 hours of continuous use in high-draw applications.
Frequently Asked Questions
Are cordless tools as powerful as corded?
For most tasks, yes. A top-tier cordless drill or impact driver from Milwaukee, DeWalt, or Makita matches or exceeds the power of mid-range corded equivalents. The gap shows up in sustained high-draw applications: angle grinding, routing, and planing. A 15-amp corded angle grinder delivers more sustained power than any cordless model currently available.
Should I buy a cordless angle grinder?
If you do short cutting and grinding tasks (under 20 minutes at a time), cordless is convenient. If you grind welds, cut a lot of metal, or do surface prep for extended periods, corded is better. Cordless grinders from Milwaukee (M18 FUEL) and DeWalt (FLEXVOLT) are genuinely powerful, but battery runtime is the bottleneck.
How many batteries do I need for a cordless platform?
Two batteries minimum for any platform. Three if you use high-draw tools regularly. Having one battery in the tool and one on the charger means you never wait. Most combo kits include two batteries. Buying a third as a spare ($50 to $100 depending on capacity) is worthwhile insurance.
Do cordless tools lose power as the battery drains?
Older NiCad batteries did. Modern lithium-ion batteries deliver consistent power output until the last 5% to 10% of charge, then cut off abruptly to protect the cells. You won't notice a gradual slowdown. The tool runs at full power, then stops. This is by design.