One rule covers most of what you actually need to know: a FLEXVOLT battery runs in every 20V MAX tool DeWalt makes, but a standard 20V MAX battery can’t run a tool built for FLEXVOLT’s 60V mode. That single sentence resolves the majority of “will this battery work in this tool” questions. Everything below fills in the specifics, including model numbers, chargers, and the older batteries that don’t cross over at all.
The One Rule That Covers Most of This
- FLEXVOLT battery in a 20V MAX tool: works, automatically drops to 20V output.
- FLEXVOLT battery in a FLEXVOLT (60V) tool: works, automatically switches to 60V output.
- 20V MAX battery in a 20V MAX tool: works, this is the standard case.
- 20V MAX battery in a FLEXVOLT-only (60V) tool: does not work. The tool needs the higher voltage a standard 20V MAX pack can’t supply.
In short: FLEXVOLT is backward-compatible with everything. Standard 20V MAX batteries are not forward-compatible with 60V-only tools.
Full Compatibility Chart
| Battery Line | Model Numbers | Voltage | Works in 20V MAX Tools | Works in FLEXVOLT (60V) Tools |
|---|---|---|---|---|
| 20V MAX (standard) | DCB201, DCB203, DCB204 | 20V MAX (18V nominal) | Yes | No |
| 20V MAX XR | DCB205, DCB206, DCB208 | 20V MAX (18V nominal) | Yes | No |
| POWERSTACK | DCBP034, DCBP090 | 20V MAX (18V nominal) | Yes | No |
| FLEXVOLT | DCB606, DCB609, DCB612, DCB615 | 20V/60V MAX (auto-switching) | Yes (runs at 20V) | Yes (runs at 60V) |
| 18V XRP (legacy) | DC9096, DC9099, DC9180 | 18V (older platform) | No (adapter required, see below) | No |
| 12V MAX | DCB120, DCB124, DCB127 | 12V MAX | No, separate platform entirely | No |
What Each Battery Line Actually Is
20V MAX (standard) is the baseline battery in the platform, using standard cylindrical lithium-ion cells at lower capacities (typically 1.5-2.0Ah). Fine for light-duty tools and occasional use.
20V MAX XR batteries use higher-capacity cell configurations (3.0Ah up through 8.0Ah and beyond) for extended runtime on the same 20V MAX platform. There’s no difference in compatibility versus standard 20V MAX, XR just means more capacity in the same footprint and connector.
POWERSTACK uses newer pouch-cell battery technology rather than the older cylindrical cell design, giving a more compact, lighter pack with higher energy density for its size. Fits and works identically to any other 20V MAX battery.
FLEXVOLT is the one line with genuinely different behavior. Internally, it can reconfigure its cells between a 20V and a 60V (54V nominal) configuration depending on what it detects when inserted into a tool. Drop it into a standard 20V MAX drill and it delivers 20V like any other pack, drop it into a 60V MAX or 120V MAX (dual-battery) tool like certain table saws or chainsaws, and it switches to deliver the higher voltage those tools need.
The DCB606 (6.0Ah) is a common FLEXVOLT choice specifically because it works across your entire DeWalt lineup, standard 20V MAX drills and impact drivers included, without needing a separate battery just for your 60V-class tools.
Legacy and Excluded Batteries
18V XRP batteries, DeWalt’s platform before 20V MAX launched in 2011, use a different physical connector and are not natively compatible with 20V MAX tools. DeWalt sells an official DCA1820 adapter that lets a 20V MAX battery power certain 18V tools, but check the adapter’s specific compatibility and exclusion list before assuming it covers your exact tool, some 18V tools and functions are explicitly not supported through the adapter.
12V MAX is a genuinely separate platform built for DeWalt’s smaller, compact tools. It does not share a battery footprint with 20V MAX or FLEXVOLT at all, and there’s no adapter path between them. If you see “12V MAX” on a tool or battery, treat it as a completely different ecosystem, not a lower tier of the 20V MAX line.
Charger Compatibility
| Charger | Charges | Approx. Charge Time (6.0Ah pack) |
|---|---|---|
| DCB107 | All 20V MAX and FLEXVOLT batteries | ~90 minutes |
| DCB112 | All 20V MAX and FLEXVOLT batteries | ~60 minutes (fast charger) |
| DCB104 | All 20V MAX and FLEXVOLT batteries (4-port simultaneous) | Varies by port load |
Every current DeWalt 20V MAX charger charges every battery in this ecosystem, standard, XR, POWERSTACK, and FLEXVOLT alike. The only real difference between charger models is charging speed, not which batteries they accept. A “slower” charger won’t damage a battery, the battery and charger communicate to regulate charge rate safely regardless of which charger you use.
Battery-Powered Accessories Worth Knowing About
The same battery footprint that powers your tools also powers a few genuinely useful accessories most compatibility charts skip:
The DCB094K USB Charging Kit plugs into any 20V MAX or FLEXVOLT battery and outputs up to 100W through a bi-directional USB-C port, enough to charge a laptop, not just a phone, plus a secondary USB-A port for smaller devices. On a job site with no outlet nearby, this turns a spare battery you’re already carrying into a real power source.
DeWalt also makes AC power inverters that plug into a 20V MAX or FLEXVOLT battery to provide a standard household outlet, useful for running small corded equipment off battery power. Check current DeWalt inverter listings directly for exact wattage and battery compatibility, since specs vary by model.
Frequently Asked Questions
Can I use a FLEXVOLT battery in a regular 20V drill?
Yes. FLEXVOLT batteries automatically detect a standard 20V MAX tool and output 20V, functioning exactly like a standard 20V MAX battery, just with the added flexibility to also power 60V tools if you own any.
Will a 20V MAX battery fit an older 18V DeWalt tool?
Not directly, the connector is different. DeWalt’s official DCA1820 adapter bridges this in many cases, but check its specific compatibility and exclusion list before assuming every 18V tool and function is supported.
Does battery Ah (amp-hour) rating affect compatibility?
No. Amp-hour rating only affects runtime and physical size/weight, not whether a battery fits or works in a given tool. A 1.5Ah and a 12.0Ah battery in the same line are equally compatible with the same tools, one just lasts longer per charge and weighs more.
Can any DeWalt 20V charger charge any DeWalt 20V battery?
Yes. Every current 20V MAX charger charges every battery in the 20V MAX and FLEXVOLT ecosystem, standard, XR, POWERSTACK, and FLEXVOLT alike. Chargers differ only in charging speed, not in which batteries they accept.
Bottom Line
If you remember one thing from this chart: FLEXVOLT batteries work everywhere in the 20V MAX and FLEXVOLT ecosystem, standard 20V MAX batteries don’t work in 60V-only tools. Everything else, XR, POWERSTACK, charger speed, is a capacity or convenience difference, not a compatibility one. The only genuine dead ends are the older 18V XRP line (adapter required, with real limits) and 12V MAX (a separate platform entirely, no adapter path). If you’re still deciding whether to build your tool collection around DeWalt in the first place, our guide to DeWalt vs. Milwaukee vs. Makita battery platforms covers that bigger-picture decision.
