Guide · Cordless and battery platforms
Genuine vs aftermarket tool batteries
Why Makita, DEWALT and Milwaukee say to use only their own packs and chargers, how counterfeits differ from 'replacement for' packs, and what CPSC's charger cases show.
Short answer
Use the tool maker's own batteries and the charger it specifies. Makita warns that non-genuine batteries may burst and cause fires, injury or property damage, and can defeat the communication between battery, tool and charger.[1] DEWALT tells users to use only authentic DEWALT batteries.[2] CPSC recommends that cells, batteries, chargers and products be tested together as a system,[3] and a third-party pack or "universal" charger breaks that system.
Why the makers insist on their own packs
A cordless tool, its battery and its charger are designed and certified together. UL Solutions tests power-tool batteries and chargers to standards including UL 2595, UL/IEC 62841-1, IEC/UL 60335-2-29 for chargers, and UN 38.3, which it says all lithium-ion batteries must pass before shipping.[4] CPSC says high-energy batteries such as lithium-ion can overheat and cause fire and thermal burns, during use, storage and charging, and recommends testing cells, batteries, chargers and products together as a system.[3]
The makers say the same in their own words:
| Maker | What it says | Source |
|---|---|---|
| Makita | Non-genuine ("knock-off") Makita lithium-ion batteries may burst and cause fires, injury or property damage, and can defeat the battery-tool-charger communication system. Using them voids the Makita warranty for tool and charger and the tool's UL/CSA approval. | Makita[1] |
| DEWALT | Use only authentic DEWALT batteries; do not use batteries with visible damage or cracks; do not attempt battery repair or service | DEWALT[2] |
| Milwaukee | Recharge only with the charger the maker specifies, because a charger suitable for one battery type may create a fire risk with another; use only specifically designated battery packs | Milwaukee[5] |
Counterfeit or just "compatible"
Two kinds of aftermarket pack turn up on marketplaces:
- Counterfeits carry the brand's name and look like genuine packs. A counterfeit battery is exactly what Makita's warning covers.
- "Replacement for" packs use their own brand name and say they fit a maker's tools. The tool maker has not designed or approved them for its system.
Makita says genuine Makita batteries are black, with the Makita logo and lithium-ion identification on both sides and the Makita logo on the bottom, and advises contacting a Makita service center if in doubt.[1] Counterfeits can copy those cues, so where you buy matters as much as what the pack looks like. DEWALT's UK support site publishes a counterfeit-identification guide as a downloadable file;[6] we have not reviewed that file, so we do not repeat its cues here.
Chargers: the "universal" problem
A charger that "fits" is not proof it is right for the pack. Two CPSC cases show what can go wrong with marketplace chargers. Neither involves power tools, so treat them as illustrations, not evidence about tool chargers:
- Hobby RC chargers. CPSC's April 2, 2026 recall of HTRC and Haisito T400 battery chargers cites 33 reports of fires and explosions. They were sold on AliExpress.us, Amazon.com, Banggood, eBay and Pyrodrone from March 2019 to March 2026.[7]
- "Universal" e-bike chargers. In September 2024 CPSC warned consumers to stop using SafPow and AMPOWSURE chargers sold on Amazon.com and eBay, marketed as universal but able to ignite incompatible 36 V lithium batteries. The firms refused to recall them.[8]
The lesson for a polisher is Milwaukee's: use the charger the maker specifies.[5]
Adapters
Adapters that let one brand's packs run another brand's tools put two closed systems together that neither maker designed for. No maker in our research approves one. Makita says its batteries are compatible only within each platform.[9]
How to buy genuine packs
- Buy the brand's pack by its part number, on the platform your tool uses.
- Check the seller, not just the listing. On Amazon, look at "Ships from / Sold by" and buy when it is Amazon.com or the brand. Canada's Office of Consumer Affairs tells online shoppers to check for "sold by", "shipped by" or "fulfilled by" wording.[10]
- Skip packs sold as a replacement "for" a brand, and any charger described as universal.
- Inspect on arrival: match the maker's appearance cues and contact the maker's service center if in doubt.[1]
We do not list batteries or chargers yet: none of the genuine packs or chargers we checked had a seller we could accept.
Next
Questions
Are aftermarket power tool batteries safe?
The tool makers say to avoid them. Makita warns that non-genuine batteries may burst and cause fires, injury or property damage, and DEWALT advises using only authentic DEWALT batteries.[1][2]
Does a non-genuine battery void the warranty?
Makita says using non-genuine batteries voids the Makita warranty for the tool and charger, and the tool's UL/CSA approval.[1]
How can I tell a genuine Makita battery?
Makita says genuine batteries are black, with the Makita logo and lithium-ion identification on both sides and the Makita logo on the bottom. Counterfeits can copy that, so buy from a seller you can check and ask a Makita service center if in doubt.[1]
Is a universal charger safe for tool batteries?
Use the charger the tool maker specifies. Milwaukee warns that a charger suitable for one battery type may create a fire risk with another, and CPSC has warned about 'universal' chargers able to ignite incompatible lithium batteries.[5][8]
Are battery adapters between brands safe?
No maker in our research approves one. Makita, for example, says its batteries are compatible only within each platform.[9]