Milwaukee 2847-20 Top-Off Charger and Power Supply Review: USB-C Power on the Go

Introduction

Milwaukee’s new top-off charger and power supply takes a different approach from the previous model that carried an AC outlet. The 2847-20 is a USB-C only unit with two ports, and it doubles as both a battery charger and a power bank for your devices. At $99 it is not cheap, but for a specific type of user it fills a genuinely useful gap.

What the Milwaukee 2847-20 Actually Does

The unit has two USB-C ports. The left port handles 100 watts and works in both directions, so it can charge the battery or push power out to charge something else. The right port is 15 watts and output only. In the box you get a 65 watt power block and a 100 watt cable. The 100 watt cable is not required for basic charging or discharging, but you will want it if you want the full 100 watt output.

One nice trick: the unit can charge a battery and output power to another device at the same time. The simultaneous output runs at 15 watts only, so it is slower, but it means you do not lose a USB-C port while the battery is topping up. If you are out riding with a battery on charge, you can keep an iPad or phone plugged in the whole time.

There is no requirement to use a specific battery on this, and smaller packs are sometimes the better choice. With a 12 amp hour Forge battery attached, the review setup could run a computer and charge multiple USB-C devices, including a phone many times over, all at up to 100 watts. Switching to the 15 watt side gives a slow charge that uses less of the battery.

Charging Times to Know Before Buying

The included 65 watt block plugs into an AC outlet and charges the battery over USB-C. A CP2.0 battery takes about 45 minutes, a 5 amp hour battery roughly 105 to 110 minutes, and the 12 amp hour Forge battery around 4 hours from empty. That is not terrible given it is charging over USB-C, but it is the main drawback for many people.

Status indicators make the process clear. When charging on the 100 watt side, the light turns red to confirm charging is happening. On a slower charger, a white turtle icon appears to signal slow charging that will take much longer.

Who This Is Really For

This is definitely not your main battery charger unless you spend a lot of time on the road and rarely use the batteries. It works best as a backup and as a mobile power supply. Think about what you will use it for and then apply the charge times to see if it fits.

The standout use case is a truck or side-by-side. Keep it plugged in while driving and a battery is always charging, which means a charged spare is nearly always ready when you arrive. That covers a work light, an inflator, a phone, or a laptop, and it solves the all-too-common problem of arriving somewhere with a dead spare battery. One charged battery can even jump start a pickup or handle small tasks in a pinch, which adds real value in survival or flat tire situations.

Things to Consider Before Buying

The $99 price is on the higher side, and the lack of an AC outlet is worth thinking about. The older top-off model with the AC outlet, which is still available, is limited to about 175 watts. That is not a lot of power, and it will not run heating elements of any real size, but it does offer options for small devices.

Since so many devices charge over USB-C today, the USB-C only design makes sense for most modern gear, and this unit is one more step in giving people options rather than replacing what came before.

Everyday Use Cases That Make Sense

Beyond the truck scenario, this fits people who forget to charge batteries before yard work. A spare kept on charge in the vehicle is ready for a string trimmer that lives in the truck. It can also work for snow plowing, where you spend far more time in the truck than with the equipment itself, though some tools need multiple batteries, which weakens the spare-carrying logic.

Buying Advice

If you want a fast main charger, look elsewhere. If you spend hours in a vehicle and want a permanently topped-up spare battery plus a 100 watt USB-C power source, this unit earns its place. Match the charging times to your usage before buying, and the trade-offs become easy to judge.

Conclusion

The Milwaukee 2847-20 is a niche tool that is excellent for the right person. It charges batteries over USB-C, delivers up to 100 watts of output, and keeps a spare battery ready in your vehicle at all times. The 4 hour charge time on large batteries and the $99 price are the main things to weigh, but as a backup charger and mobile power supply, it is a genuinely useful addition.