Choosing a Cordless Tool Battery Platform
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When you buy your first cordless tool, you're really choosing a battery platform. Batteries usually only fit tools from the same brand's system, so every later tool is cheaper if you stay put. Here's how three of the biggest platforms describe themselves, and a framework for choosing. We haven't run performance tests, and we don't rate one brand as "best."
What each brand says about its system
| DEWALT 20V MAX | Milwaukee M18 | RYOBI 18V ONE+ | |
|---|---|---|---|
| Tool family size (brand's own figure) | "More than 250 tools" (2021 press release) | "Over 325 solutions" | "300+ compatible products" |
| Voltage note | 20 V maximum initial; 18 V nominal (DEWALT footnote) | 18 V system | 18 V system |
| Backward compatibility | DCA1820 adapter lets 20V MAX batteries run most older 18V DEWALT tools, with listed exceptions | M18 batteries fit M18 tools ("if it's M18, it fits") | Says ONE+ battery compatibility has held since 1996 |
| Battery tiers mentioned | Includes FLEXVOLT and other lines | REDLITHIUM, HIGH OUTPUT, FORGE tiers | Lithium and "HP" brushless lines |
| Also covers | Trade-focused lines | Trade-focused tools | Lawn and garden, cleaning, and DIY tools |
Figures are each company's own claims at the time we read their pages (linked below). Tool counts change often.
A decision framework
1. What batteries do you (or the gift recipient) already have?
This beats everything else. If someone owns three RYOBI tools, a RYOBI tool-only gift is worth more than a "better" tool on another platform.
2. What will you use it for?
- Household projects, furniture, occasional woodworking, and yard tools: RYOBI positions ONE+ for DIY and lists a wide range of lawn, garden, and cleaning products alongside tools.
- Heavy, frequent use or trade work: DEWALT and Milwaukee both market trade-focused tool families. Milwaukee describes M18 as "professional grade" and "trade focused."
- A mix: any of the three covers the basics (drill, impact driver, saws, sander).
3. Which specific tools will you want next?
Check whether the platform offers the next two or three tools you expect to buy, such as a specific saw, nailer, outdoor tool, or light.
4. Where can you get service and batteries?
Consider where each brand is sold near you and how warranty service works. Check each maker's current warranty terms on their site.
5. Hold the tool
Weight, balance, and grip vary. If possible, handle the tools in a store.
Kits vs. tool-only
- Kits include battery and charger. Good for the first tool on a new platform.
- Tool-only (sometimes called "bare tool") versions are cheaper and ideal once you own batteries.
- Combo kits (for example, drill plus impact driver) often bundle batteries and can be a cost-effective way to start.
DEWALT 20V MAX kits → Amazon · Milwaukee M18 kits → Amazon · RYOBI ONE+ kits → Amazon
About third-party battery adapters
Adapters that let one brand's batteries run another brand's tools exist, but they're not made or supported by the tool makers. They may affect warranty coverage and safety. We don't recommend them as a gift.
About old batteries
DEWALT's 2021 announcement notes it phased out its 18V NiCad batteries and discontinued the 18V XRP lithium battery line, encouraging users to move to 20V MAX. If someone has old DEWALT 18V tools, the DCA1820 adapter is DEWALT's own route. Check its listed exceptions: it's not compatible with FLEXVOLT or with DCB206, DCB208, and DCB210 batteries.
The bottom line
There's no universally right answer. Choose the platform that (1) matches batteries already owned, (2) offers the tools you'll want next, and (3) feels right in hand.
FAQ
Can I use DEWALT batteries on Milwaukee or RYOBI tools?
Not natively. Each brand designs batteries for its own system. Third-party adapters exist, but they aren't made or supported by the tool makers, so check warranty implications.
Is DEWALT 20V MAX really 20 volts?
DEWALT's own footnote says maximum initial battery voltage (measured without a workload) is 20 volts and nominal voltage is 18.
Do old DEWALT 18V tools work with 20V MAX batteries?
DEWALT says its DCA1820 adapter lets 20V MAX batteries work in most 18V DEWALT tools, with listed exceptions. It is not compatible with FLEXVOLT or certain larger 20V MAX XR batteries.
Related guides
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- Workshop Gifts Under $25, $50, and $100