Used power tools are one of the most reliable categories to flip: the brands are well known, buyers trust them, and the good ones hold value. But the same listing can be a $150 profit or a $20 headache depending on details you can only catch if you know where to look. Here's the checklist experienced flippers run before they drive anywhere.
Buy the brands that hold value
Cordless platforms with a big installed base resell fastest because buyers already own batteries for them. In the US that's Milwaukee M18, DeWalt 20V MAX, Makita LXT, and Ridgid at the top, with Ryobi moving well at lower price points. Off-brand and store-brand cordless tools are much harder to move — the battery is proprietary and worthless to most buyers.
Corded tools and bare tools (no battery) are fine to flip too, but price them against what they actually are: a "kit" photo showing a charger and two batteries is worth far more than the same drill sold bare.
The battery is where the money hides
On any cordless tool, the batteries are often worth more than the tool. A genuine Milwaukee or DeWalt battery can be $80–$150 on its own. That cuts both ways:
- A "tool only" listing priced like a kit is a trap — you're paying for batteries you won't get.
- A cheap listing that happens to include good batteries can be a steal even if the tool itself is average.
- Dead or swollen batteries are a real cost. If the seller won't confirm they hold a charge, assume you'll be buying replacements and price accordingly.
Spotting a dead battery in a photo
You usually can't confirm a battery is good from a photo — but you can spot a bad one. Look for a swollen or cracked battery case, corrosion or green residue on the terminals, and whether the fuel gauge lights are shown lit. "Works great" with no photo of the tool powered on is a claim, not evidence. Treat it as unknown and negotiate like the batteries are dead until proven otherwise.
Condition red flags that quietly kill your margin
- Missing chuck keys, guards, or attachments — a table saw missing its fence or a grinder missing its guard sells for a fraction and can be unsafe.
- Water or rust beyond light surface rust — internal corrosion means bearings and switches are on their way out.
- Frayed cords or taped repairs on corded tools — a safety issue that tanks resale.
- "For parts / not working" — sometimes a great buy for a repair flip, but only if you actually know the fix and the part cost. Otherwise it's inventory that never sells.
- Counterfeits — cheap "Milwaukee" batteries and tools are common. Odd fonts, wrong charger, and a price that's too good are the tells.
Do the math before you drive
A profitable flip isn't just resale minus asking price. Subtract your real costs: fuel and time to pick it up, any replacement batteries or parts, a clean-up, and selling fees if you ship it. Then ask the question that actually matters — is the profit worth the hours? A $120 profit you grab on the way home beats a $180 profit that eats a whole Saturday.
Anchor your resale estimate on recently sold listings, not hopeful asking prices (more on that in how to price used items to resell). Then work backward to the most you should ever pay and don't go above it at the curb.
Let the tedious part be automatic
Running this checklist on every listing by hand is the part that burns out resellers. That's exactly what Worth Radar does: it watches your local marketplaces, reads each new tool listing's photos and condition, cross-checks the resale value against real sold comps, and gives you a profit-per-hour and a max-buy price — so you only spend your time on the ones worth chasing.