Do HART Batteries Fit Other Brands? Compatibility Explained
HART batteries do not fit other brands. HART 20V and 40V packs are built for HART tools and chargers, and we found no HART or Walmart statement that any other brand’s battery fits them. Unofficial adapters are sold for a few brands, but they are not endorsed by HART and raise safety and warranty questions. This guide covers what fits what inside the HART system, why a shared parent company does not help, what adapters really involve, and what the 2025 HART discontinuation means for your batteries.
Do HART Batteries Fit Other Brands?
Best Genuine HART Charger Pick | |
 |
HART 20V Charger CGH002 (battery not included), $74.99 The one rule every source agrees on is to keep tool, battery and charger on the same platform, and a genuine HART charger is the simplest way to do that for a 20V pack.
|
As an Amazon Associate we earn from qualifying purchases. | |
No. The short version is that a HART battery is made to work with HART tools and HART chargers, nothing else. HART’s own guidance, as summarized on an independent HART reference site, is to match the tool, battery and charger before choosing capacity, and not to assume that another brand’s pack or an adapter is officially supported. Garage Almanac likewise describes the HART 20V pack as its own footprint, not cross-compatible with competing systems.
The table below sums up what we could confirm. “Not documented” means we looked for a statement from HART, Walmart or the other maker saying the packs fit together and did not find one. It does not mean we tested the combination, and we have not.
| Battery | Fits HART 20V tools? | Fits HART 40V tools? | What we found |
|---|---|---|---|
| HART 20V pack | Yes | No | Same platform, fits all HART 20V tools |
| HART 40V pack | No | Yes | 40V is documented as a separate platform |
| Milwaukee M18 | Not documented | Not documented | Only via unofficial third-party adapters |
| DeWalt 20V MAX | Not documented | Not documented | Only via unofficial third-party adapters |
| RIDGID 18V | Not documented | Not documented | Only via unofficial third-party adapters |
| Ryobi, Greenworks, Black+Decker | Not documented | Not documented | No adapter or maker statement found |
How the HART 20V and 40V Platforms Work
HART sells two cordless systems, and the rule inside each one is simple. Any HART 20V battery fits any HART 20V tool, and any HART 40V battery fits any HART 40V tool. The two systems do not cross: the 40V platform is documented as separate from HART 20V, so a 20V pack will not run a 40V product and the reverse is also true.
That makes the voltage on the tool or its label the first thing to read. Per the HART reference site, 40V is the platform used for HART outdoor equipment, while the 20V line covers the hand-held cordless tools. Chargers follow the same split: a 20V charger will not charge a 40V pack.
| Platform | Typical use | Matching charger on Amazon today | Price checked Oct 7, 2026 |
|---|---|---|---|
| HART 20V | Hand-held cordless tools | HART 20V Charger CGH002 | $74.99 |
| HART 20V | Hand-held cordless tools | HART 20V 2.0 Amp Fast Charger | $83.99 |
| HART 40V | Outdoor equipment | Hart 40 Volt Battery Charger | $97.44 |
| HART 40V | Outdoor equipment | Hart 40V Dual Port Fast Charger | $109.69 (listed as available on a future date) |
We include prices because they change the math for anyone tempted to improvise. A genuine 20V charger is $74.99 today, and a single unofficial adapter is listed by one seller at $38.99 before you even buy the other brand’s battery. The savings from mixing brands are smaller than they first look.
The most common mistake we see in forum answers is to reason that HART, Ryobi, RIDGID and Milwaukee all come from the same parent company, so the batteries must swap. HART is a Walmart house brand made by TTI, which also owns Ryobi, RIDGID and Milwaukee, and Garage Almanac states plainly that this does not enable cross-compatibility. A corporate family tree is not a connector standard.
One site we read suggested limited Ryobi compatibility because of the shared ownership. We could not find any manual or maker statement that supports it, so we do not repeat it as fact. If a claim like that matters to your purchase, ask the manufacturer in writing before you rely on it.
The same pattern shows up across the big cordless brands. We cover it for other systems in our guides on whether DeWalt and Craftsman batteries are interchangeable, whether Milwaukee batteries work with other brands, and whether Bosch and Milwaukee 12V batteries are interchangeable. In every one of them, the safe answer is to stay inside one maker’s platform.
What About Adapters and Third-Party Batteries?
Adapters exist. One specialist seller listed four adapters that let other brands’ packs power a HART 20V tool: Milwaukee M18, DeWalt 20V MAX, RIDGID 18V and AEG 18V, at $38.99 each, all showing as sold out when we checked. The same seller says it does not make adapters that run HART packs on other brands’ tools, so the direction is one-way.
We do not recommend this route, and HART does not endorse it. An adapter creates an electrical path between a pack and a tool that neither manufacturer designed or tested together. That raises the usual lithium-ion concerns of overheating and damage, and it may affect your warranty on the tool, the battery or both. We could not find a HART warranty statement covering adapters, so check your own tool’s warranty terms rather than assuming.
- If a pack or tool gets unusually hot, stop using it. Even the adapter seller advises stopping if the tool noticeably slows, runs unusually hot or the contacts look damaged.
- Do not use damaged, swollen or modified packs in any tool or charger.
- Use the charger made for the pack. A charger from another system is a separate risk from the adapter itself.
Third-party replacement packs sold as “fits HART 20V” are a different case from adapters, since they are built to slide into the tool directly. Those listings are the seller’s claim, not a HART approval. If you buy one, compare the connector end with your tool, expect a shorter warranty or none from HART, and be wary of capacity numbers that look too good for the price.
HART Is Being Discontinued: What It Means for Your Batteries
This is the angle most compatibility articles miss. ToolGuyd reported that TTI is discontinuing the HART business, and TTI’s announcement was dated December 11, 2025. The same report notes TTI said the HART brand will remain in its portfolio, with no details about what that means. We found no official statement on warranty service, support or future battery supply for existing owners.
TTI announced the discontinuation of the HART business on December 11, 2025. Source: ToolGuyd.
Here is how that should change your decisions today.
| Your situation | Sensible move | Why |
|---|---|---|
| You own HART tools and they work fine | Keep using genuine HART packs and chargers | Nothing in the compatibility rules changed |
| Your charger died | Replace it with a genuine HART charger of the same voltage | Same-platform charger avoids guesswork; one was in stock when we checked |
| You need spare packs | Compare genuine packs while you can; stock levels vary | We saw a HART 1.5Ah 20V battery listed out of stock |
| You are buying your first cordless tool | Weigh a platform with a secure future | HART future battery and parts supply is unconfirmed |
| You want to mix brands | Buy the tool from the brand whose batteries you own | Avoids adapters and warranty questions |
Some retailers have been clearing HART stock, and one report says Walmart has brought in Greenworks in some places. Neither fact tells you that Greenworks batteries fit HART tools, and we found nothing saying they do.
How to Check Battery Compatibility for Any HART Tool
Whenever you are unsure whether a pack will work, run through the steps below before you try anything.
- Read the voltage on the tool. It will be marked 20V or 40V, and the battery must match.
- Check that the pack says HART. A matching voltage number on a different brand is not a guarantee.
- Look up the exact model in its manual. The manual lists the supported battery platform for that tool.
- Match the charger to the same platform. A 20V charger does not charge a 40V pack.
- Do not force a pack that does not slide in smoothly. If the footprint is different, it is a different system.
Frequently Asked Questions
Do HART 40V batteries work in HART 20V tools?
No. HART 20V and 40V are separate platforms, so a 40V pack will not run a 20V tool and a 20V pack will not run a 40V tool. Within each platform, any HART pack of that voltage fits any HART tool of that voltage, whatever its amp-hour rating.
Can I use a Milwaukee battery on a HART tool?
Not directly. The pack and the tool use different connectors, and we found no HART or Milwaukee statement that says the two fit together. Third-party adapters are sold, but they are unofficial and we do not recommend them. The safer route is to buy HART tools with HART batteries, or to buy the tool in the brand whose batteries you already own.
Do Ryobi batteries fit HART tools?
We found no maker documentation saying they do. HART is made by TTI, which also owns Ryobi, but sharing a parent company does not make two battery systems interchangeable. Treat Ryobi and HART packs as separate systems unless a manufacturer manual says otherwise.
Are HART 40V batteries interchangeable with Greenworks or other 40V brands?
We found no HART or Greenworks documentation that says they are. A matching voltage number is not a compatibility guarantee, because the shape, contacts and electronics matter too. Check the exact tool’s manual before trying any pack from another brand.
Can you still buy HART batteries and chargers?
For now, yes. Genuine HART 20V and 40V chargers were listed in stock on Amazon when we checked on October 7, 2026, though the 1.5Ah HART 20V battery we looked at was out of stock. TTI announced on December 11, 2025 that it is discontinuing the HART business, so long-term availability is uncertain.
The Bottom Line on HART Battery Compatibility
Keep HART batteries with HART tools, keep 20V with 20V and 40V with 40V, and treat anything else as unsupported. The brand is on its way out of the market, so the best protection for your tools is a genuine charger and a couple of genuine packs while they are still on shelves. If you are shopping across brands, our DeWalt and Craftsman guide shows the same logic applied to another platform.
Sponsored / affiliate links. As an Amazon Associate I earn from qualifying purchases. I may earn additional commission from eligible campaigns.
