DeWalt DCB205, Milwaukee M18, and Makita 18V LXT: Genuine Batteries vs Counterfeits

Introduction

Counterfeit power tool batteries are one of the easiest scams to fall for. The packaging looks nearly identical, the model numbers match, and the fakes are often sold as “new, sealed, and authentic.” A side-by-side comparison of genuine and counterfeit packs for the DeWalt DCB205, the Milwaukee M18, and the Makita 18V LXT shows just how big the real-world gap is, in both performance and safety.

How the Counterfeits Get Past Buyers

The fakes are convincing. Counterfeit DeWalt DCB205 packs carry serial numbers, date codes, and a working battery-level indicator, and one even registered successfully on the manufacturer’s website. The genuine DCB205 weighs 647 g while the counterfeit comes in 43 g lighter, and the fake uses an older case design and skips the QR code found on current genuine packs. Opening a counterfeit reveals the biggest difference: no control board at all, and unlabeled cells where genuine packs use Samsung 25R cells.

Counterfeit Milwaukee M18 packs ship with instructions meant for other voltage models, hard-to-read serial number printing, and green cells hiding inside a plastic molding instead of blue ones. The counterfeit Makita even includes a rubber anti-tamper plug over a case screw, where the genuine part is hard plastic. Across the board, the counterfeits weigh noticeably less than the originals.

The price gap is what makes the scam tempting: a pair of authentic DeWalt batteries costs $130 against $82 for the counterfeits, genuine Milwaukee runs $79 versus $44.50, and authentic Makita is $90 against $45 for the fake. The savings evaporate once you look at performance and safety data.

Real-World Tool Performance

With a drill in second gear, the counterfeits consistently ran out of steam. The fake DeWalt delivered 115 in-lb versus 152 for the genuine pack, the counterfeit Milwaukee managed 128 in-lb against 154, and the fake Makita hit 123 in-lb versus 144. The genuine batteries allowed roughly 15 to 20% more torque across all three brands.

Impact driver testing showed the same pattern with more drama. The genuine DeWalt got faster with each lag bolt, finishing its fastest at 8.3 seconds, nearly two seconds quicker than the counterfeit’s best run. The genuine Milwaukee posted 5.36 seconds at its best while the counterfeit struggled at 6.96. The genuine Makita’s fastest attempt came in at 8.57 seconds, almost 1.5 seconds faster than the fake. Authentic packs were around 17 to 19% faster overall.

High-Drain Endurance Tests

Sustained loads separated the packs even more clearly. Powering a 150 W fan through an inverter, the counterfeit Milwaukee died at just under 23 minutes with the pack hot to the touch, while the genuine Milwaukee kept going to about 31.5 minutes. In a leaf blower test, the counterfeit DeWalt quit at 10 minutes 10 seconds against 12 minutes 10 seconds for the genuine pack, and both authentic packs held hundreds of cubic feet per minute more air speed throughout.

Grinder testing was harsher still. The counterfeit Milwaukee kept powering down under load and shut off 11 times in 75 seconds before refusing to restart. The genuine packs not only lasted longer, roughly 2.5 minutes versus seconds, they also maintained far higher RPM and protected themselves by shutting down gracefully instead of overheating.

Under a constant 7 A drain, the capacity gap became stark. The counterfeit DeWalt delivered 65.3 Wh against its advertised 100 Wh, while the genuine reached 84.78 Wh in 41 minutes. The counterfeit Milwaukee managed 56.5 Wh versus 86.63 Wh for the genuine pack. The counterfeit Makita fared worst of all, collapsing to 16.1 V within five minutes and dying at just 7.5 minutes, while the genuine Makita ran about 44 minutes and delivered 88.5 Wh.

Short-Circuit Safety

Safety testing made the stakes unmistakable. The genuine DeWalt and counterfeit packs spiked to 248 and 290 amps on a dead short; the genuine pack cut off in under a second, while the counterfeit smoked and died. The counterfeit Milwaukee smoked at 211.7 amps, and the genuine Milwaukee packs, surprisingly, tried to power through a dead short for 14 to 17 seconds before failing, which is worth noting even though neither caught fire.

Teardowns told the rest of the story. Counterfeit packs rely on interconnects that act as fuses rather than proper protection, and their cells are unlabeled, clearly not the Samsung 25R cells genuine packs use. Internal short testing showed genuine cells are individually protected and manage the event safely, while counterfeit 18650s are not designed to discharge safely and posed a genuine fire risk.

Buying Advice

Across every test, the genuine batteries delivered roughly 15 to 20% more torque, drove lag bolts 17 to 19% faster, and lasted dramatically longer under sustained load, all while shutting down safely instead of overheating. The counterfeits lost capacity, ran hot, failed under load, and in the worst cases could not be charged again or died entirely.

DeWalt DCB205

The genuine DeWalt DCB205 is the pick for anyone already in the DeWalt 20V ecosystem. It delivered the most torque of the three genuine packs in drill testing, held a clear air-speed lead for two extra minutes in the blower test, and provided 84.78 Wh under a constant drain. Its new case design, QR code, and proper control board are worth verifying at purchase.

Milwaukee M18

The genuine Milwaukee M18 was the standout for heavy sustained loads. It powered the fan for about 31.5 minutes, drove lag bolts fastest of the three genuine packs at 5.36 seconds, and delivered 86.63 Wh under constant drain. One caveat from testing: its overload protection took a long time to trip during a dead-short test, though the pack did not catch fire.

Makita 18V LXT

The genuine Makita 18V LXT 6.0Ah-class pack posted the best constant-drain result at 88.5 Wh and around 44 minutes of runtime. The counterfeit version of this pack was the most dangerous tested, dropping to 16.1 V within five minutes and failing entirely, so verifying the hard plastic anti-tamper plug and encapsulated cells matters here more than anywhere.

Conclusion

The counterfeits look nearly identical on the outside, but under real loads they deliver less torque, less speed, less runtime, and far less safety. Paying the extra $30 to $45 for a genuine DeWalt DCB205, Milwaukee M18, or Makita 18V LXT battery is not a premium for the logo; it is payment for proper cells, a real control board, and protection that actually works. If a deal looks too good, weigh the pack, check the case details, and buy from a seller you trust.