Milwaukee Packout Four-Bay Supercharger Review: Charge Four Batteries at Once

Introduction

Milwaukee’s Packout-compatible four-bay supercharger aims at a specific problem: getting multiple batteries back to work as fast as possible. Unlike a basic multi-bay charger, it can charge four batteries at the same time and supercharge compatible Forge packs, adjusting its output on the fly depending on what is plugged in.

Who This Charger Is For

This charger makes sense if you regularly run out of charged batteries mid-job, or if you manage a small fleet of cordless tools and want everything topped up overnight or between tasks. It accepts both M12 and M18 batteries, so you can mix pack sizes in a single session instead of juggling separate chargers.

It also works with standard batteries, not just Forge packs. The charger identifies each battery and pushes out whatever current that pack can safely accept, so you are not locked into one battery family to get value from it.

How the Smart Charging Works

The power distribution is the interesting part. With four batteries seated, the first battery in gets the supercharge treatment, drawing the most current at roughly six to nine amps, while the remaining three share the rest of the available power. Once a battery finishes, the charger recalculates and can supercharge two packs simultaneously in a counterclockwise rotation until everything is full.

Pull a battery out mid-cycle and the charger adapts again: with one bay empty, it has enough headroom to supercharge two at once, which is more capable than the two-bay model that could only supercharge a single pack at a time. A flashing green and red light signals a battery that is not charging properly, so faulty packs are easy to spot.

Charging Speed and Power Draw

The stated numbers are strong: one 12 amp hour battery charges in about 45 minutes, and all four 12 amp hour batteries finish in about 90 minutes. On a meter, the charger peaked at around 6.6 amps and roughly 784 watts with four Forge batteries attached, and it stayed near that level even when supercharging two packs, so a standard 15 amp household circuit handles it comfortably.

Things to Consider Before Buying

Not everyone wants to fast-charge their batteries all the time, and rapid charging is the whole point here. If you prefer slower, gentler charging cycles for battery longevity, this may be more charger than you need. It also occupies half of a Packout stack, which is worth planning around if your storage is already full.

Cooling and Noise

The built-in fans move a serious amount of air. You can feel it coming out through the batteries, and with four Forge packs seated, the fans kick up and the unit gets noticeably loud. That airflow is a genuine benefit for hot packs: the cooling channels are designed around Forge batteries, which allow far more air through than standard packs. Standard packs still get some airflow, but the benefit is smaller.

If cooling down hot batteries between tasks is a priority, this is where Forge packs get the most out of the design.

Packout Integration and Transport

The charger is fully Packout compatible and takes up half of a stack, leaving room for something like a radio on the other side. A built-in cord wrap keeps everything tidy when moving it around, and it is compact enough to live in a vehicle. If you do mount it in a van, use some form of barrier or cage between the charger and the seating area so nothing can fly forward in an accident.

Buying Advice

If your goal is to charge a large number of batteries as fast as possible, this is currently the charger to do it with. It is best suited to contractors, fleet users, and heavy DIY users with multiple Forge or standard packs in rotation. If you only ever charge one or two batteries at a leisurely pace, a smaller charger will do the job for less.

Conclusion

The Milwaukee Packout four-bay supercharger combines simultaneous four-bay charging, smart power distribution, active cooling, and stackable storage compatibility in one unit. For anyone juggling multiple batteries on a job site, it is a straightforward upgrade that gets packs back to work quickly and keeps hot batteries cool while it does it.