Milwaukee M18 Battery Charger 4-Port Fast Charging Station 18V

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If you’re running a busy Milwaukee M18 tool setup on the jobsite, you’ve probably experienced the frustration of watching multiple batteries die while only one charges at a time. We found ourselves in this exact situation on a recent commercial framing project, constantly swapping batteries and losing productivity. That’s when we decided to test the Taingwei N18 4-Port Simultaneous Charger to see if it could solve this workflow bottleneck.

After putting this charger through several weeks of real-world testing across multiple jobsites, we can tell you upfront: it’s a game-changer for crews running multiple Milwaukee M18 tools. While it’s not an official Milwaukee product, this third-party charger delivered impressive performance that kept our battery rotation flowing smoothly. Here’s everything we learned from our hands-on testing.

Why the Taingwei N18 4-Port Battery Charger Stands Out

The standout feature here is genuine simultaneous charging across all four ports. We’ve tested other multi-port chargers that claim simultaneous charging but actually cycle between batteries. The Taingwei N18 actually charges all four batteries at once, which we verified by monitoring the temperature and charge indicators on multiple batteries simultaneously. On a recent deck build, we kept four 5.0Ah batteries rotating through this charger and never once ran out of power, even running a circular saw and impact driver continuously.

What surprised us most was the rapid charging speed. We timed a completely depleted 48-11-1850 5.0Ah battery from zero to full charge in 62 minutes—that’s comparable to Milwaukee’s official M18 Rapid Charger at roughly 60 minutes. With four ports working simultaneously, you can charge 20Ah of total battery capacity in just over an hour, which is a massive productivity boost compared to sequential charging.

The build quality exceeded our expectations for a third-party accessory. The housing is solid ABS plastic with excellent heat dissipation vents on three sides. After charging batteries continuously for 8+ hour days, we noticed the unit stayed remarkably cool—much cooler than Milwaukee’s official multi-bay charger we tested side-by-side. The LED indicator system is simple but effective, with clear red (charging) and green (complete) lights for each bay.

One feature we didn’t anticipate appreciating so much: the compact footprint. At roughly 10 inches wide and 7 inches deep, this charger fits perfectly on a workbench or in a gang box without dominating space. We’ve used Milwaukee’s official 6-port station, and while it charges more batteries, it takes up significantly more real estate. For smaller crews or mobile setups, the Taingwei strikes a better balance.

Key Features & Specifications

• Four simultaneous rapid charging ports: Each port delivers independent charging current, so all four batteries charge at full speed simultaneously—no power sharing or cycling between ports.
• Compatible with all Milwaukee M18 lithium-ion batteries: Works with 48-11-1815, 48-11-1820, 48-11-1828, 48-11-1840, 48-11-1850, 48-11-1852, 48-11-1860, and 48-11-1862 battery models. We tested it with 2.0Ah, 5.0Ah, and 6.0Ah packs without issues.
• Smart charging technology with temperature monitoring: Built-in sensors detect battery temperature and adjust charging current to prevent overheating. The system automatically pauses charging if a battery gets too warm, then resumes when safe.
• Charging time specifications: 2.0Ah batteries in approximately 30 minutes, 5.0Ah batteries in 60-65 minutes, 6.0Ah+ batteries in 75-90 minutes depending on initial charge level.
• LED indicator system: Individual red/green LED lights for each port clearly show charging status. Red means actively charging, green indicates complete charge, and no light means no battery detected.
• Input: 100-240V AC, 50/60Hz: Works with standard North American outlets and international voltage without adapters—useful for contractors working across different regions.
• Multiple protection systems: Over-current protection, over-voltage protection, short-circuit protection, and over-temperature protection keep both batteries and charger safe during operation.
• Dimensions: 10.2″ x 6.9″ x 3.5″: Compact enough for mobile tool setups while maintaining stable footing with non-slip rubber feet.

Hands-On Performance Testing

We put the Taingwei N18 through three weeks of real-world testing across multiple scenarios to see how it performed under actual working conditions. Our first test was on a residential remodel where we were running two Milwaukee M18 Fuel impact drivers, a circular saw, and an oscillating multi-tool. We started each morning with four fully depleted 5.0Ah batteries and timed the charging process. Consistently, all four batteries reached full charge in 62-65 minutes, meaning we had 20Ah of capacity ready to go after just over an hour of setup time.

The temperature management during simultaneous charging impressed us. Even with all four bays occupied and actively charging 5.0Ah batteries in a non-climate-controlled garage (ambient temperature around 78°F), the charger housing remained only slightly warm to the touch. The batteries themselves stayed within normal charging temperature ranges—we measured external battery temperatures with an infrared thermometer and saw readings between 95-105°F during active charging, which is well within safe parameters. By contrast, when we tested Milwaukee’s official Rapid Charger in the same conditions, battery temperatures ran 5-8 degrees warmer.

We also tested mixed battery capacity charging, which is common in real-world use. We loaded the charger with a 2.0Ah compact battery, two 5.0Ah batteries, and one 6.0Ah High Output pack simultaneously. Each battery charged at its optimal rate independently—the 2.0Ah finished in about 28 minutes while the 6.0Ah continued charging for another 45 minutes. This confirmed true simultaneous charging rather than power-sharing across ports.

One particularly useful test involved a full day of continuous use on a deck construction project. We kept four batteries in constant rotation: two on tools, two on the charger. This setup maintained uninterrupted power throughout an 8-hour workday with heavy tool use. The charger ran continuously for the entire duration without overheating, error codes, or performance degradation. This is the kind of reliability professional crews need.

We did encounter one minor quirk: occasionally when inserting a battery, it wouldn’t immediately register and the LED wouldn’t illuminate. A quick removal and reinsertion always resolved it—likely just a seating issue with the contact points. This happened maybe once every 15-20 battery swaps and became less frequent after the first few days of use, suggesting the contacts may need a brief break-in period.

What We Liked (Pros)

True simultaneous four-port charging: Unlike some competitors that alternate between batteries, this charges all four at full speed simultaneously. We verified this by monitoring charge progress on all ports—they all advanced at consistent rates without any apparent power sharing or cycling behavior.

Charging speed matches OEM performance: At 60-65 minutes for a 5.0Ah battery, the Taingwei performs identically to Milwaukee’s official Rapid Charger at a fraction of the cost. For crews needing to charge multiple batteries, you’re getting four Milwaukee-equivalent charging speeds in one compact unit.

Excellent heat management: After weeks of testing with continuous operation, the cooling system consistently outperformed Milwaukee’s official multi-bay charger. Both the charger housing and the batteries themselves ran cooler, which should theoretically extend battery lifespan over time.

Compact and jobsite-friendly design: The footprint is roughly the size of a small toolbox, making it easy to integrate into existing workbench setups or tool trailers. The non-slip rubber feet keep it stable even on slightly un