ZMI USB PD Laptop Backup Battery review

ZMI USB PD Backup Battery & Hub review

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Last Updated on January 1, 2024 by Daniel Osakwe

The ZMI USB PD Backup Battery & Hub is a great backup battery to have with you no matter where you go. The hub allows me to charge multiple devices at once and the battery charges quickly to give me that peace of mind.

It feels great knowing I have something in my backpack that can charge my devices even when I don’t have electricity nearby. I use this with everything from my laptop to my phone.

This is one of a few backup batteries on the market nowadays but its portable and compact size makes it a great option to take with you anywhere you go.

Putting the ZMI USB PD Backup Battery & Hub to the test

ZMI USB PD Backup Battery & Hub

A 2015 12-inch MacBook battery, which currently has a 4,220mAh capacity, took about 150 minutes to charge via USB-C with the PowerPack 20000. This used about three-quarters of the PowerPack 20000’s charge. (The MacBook battery has a capacity of over 5,000mAh.) With 54 Watt-hours being used for passing 35 Watt-hours, this is an inefficiency of 25 to 35 percent.

About the same time was required to fully recharge the PowerPack 20000. The battery does not come with an adapter, so it could be tricky to find one to match PowerPack 20000’s power output. ZMI, however, offers its own 45-watt charger for $20.

Due to its high wattage, the battery can be actively used with a MacBook or MacBook Pro to maintain a charge or to increase battery capacity. If your MacBook Pro has a larger screen or an advanced battery pack, you may not be able to keep up with the drain. However, you will be able to extend battery life by several hours. As an example, the PowerPack 20000 is equivalent to about a quarter charge for a brand-new 12-inch MacBook, up to about two-thirds for a 15-inch MacBook Pro.

ZMI USB PD Backup Battery & Hub: Cables and ports available

ZMI USB PD Backup Battery & Hub

It includes two USB-A jacks and a USB-C port for charging and recharging. Both make use of 2.4A charging from 5V (12W), 2A charging from 9V (18W), and 1.5A charging from 12V (18W), but they share an 18W maximum output.

An included USB-C cable allowed the PowerPack 20000 to charge and recharge the laptop. There’s also a nifty USB Type-A to USB-C and USB Micro-B cable included—it’s a single cable with a USB-C adapter on one end, and a Micro-B end on the other for charging devices other than Apple smartphones. The battery is rectangular in shape and measures 6.3 by 3.2 by 0.8 inches. It weighs just over 14 ounces. A warranty of 18 months is provided by the company.

The battery’s sole feature is that when pressed, its sole button interrupts charging for a fraction of a second to check its internal status. I find it odd, and it is something I have never seen with a battery pack before. 

The status-check button can be pressed twice to enter the USB hub mode, which turns the status indicator LED blue.

Pros Cons
A USB-C/Micro-B/Type-A combo cable is included It does not come with a high-wattage charger
Charges at up to 45W
As long as the Mac is in active use, it will continue to charge
Up to 40W of charging power for USB-C devices

Final thoughts

With its fast speeds, compact design, well-built construction, and great price, the PowerPack 2000 is a standout. This is an excellent on-the-road battery.