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Do DeWalt FLEXVOLT batteries work with 20V MAX tools?
Understand DeWalt's documented dual-voltage relationship, what automatically switches, and why exact tool, charger, and package checks still matter.
Yes, for documented 20V MAX tools
DeWalt states that FLEXVOLT batteries are compatible with DeWalt 20V MAX power tools and automatically switch voltage when moved between supported tools [1]. The DCB609 is explicitly presented as a dual-voltage 20V/60V MAX pack [2]. This is a manufacturer-defined relationship within DeWalt's system, not a general rule that batteries with similar labels are interchangeable.
What switches and what does not
The battery configuration supplies the supported voltage class when installed in the appropriate tool. The tool itself does not become a 60V MAX tool, and a conventional 20V MAX-only pack does not become a FLEXVOLT pack. DCB612's official page lists compatibility with 20V MAX, 60V MAX, and supported 120V MAX arrangements [3]. The exact model and application still matter.
| Combination | General documented direction |
|---|---|
| FLEXVOLT battery → supported 20V MAX tool | Supported by DeWalt's FLEXVOLT guidance |
| FLEXVOLT battery → supported 60V MAX tool | Supported by the FLEXVOLT system |
| 20V MAX-only battery → 60V MAX tool | Do not infer support |
| Another brand's battery → DeWalt tool | Not established by FLEXVOLT documentation |
Why exact tool checks remain necessary
System-level documentation is the starting point, not permission to ignore individual manuals. Battery dimensions can affect clearance. Some equipment uses two FLEXVOLT packs for a supported 120V MAX arrangement. A product page may state a recommended pack for a claim. Inspect the full tool model, type number where applicable, required quantity, and current manual before relying on a configuration.
Check the charger as a separate pair
A battery-to-tool answer does not prove a charger relationship. Confirm that the exact charger lists the FLEXVOLT pack and observe its temperature and fault indicators. Do not use a nearby charger model because its housing looks similar. When buying, distinguish DCB609 from DCB609G and single packs from multipacks; related names can represent different packages or housings.
Etrenank publishes only documented catalog relationships. If the exact battery, tool, or charger is absent, consult the manufacturer instead of treating a broad system statement as a substitute for the missing pair.