ZMI Powerpack 20000

includes two USB Type-a jacks as well. Each of them can charge from 5V at 2.4A (12W), 9V at 2A (18W), and 12V at 1.5A (18W), but the two together share a maximum 18W output.

The Powerpack 20000 includes a USB-C power cable that handled charging the Macbook and recharging the internal battery pack. ZMI also includes a nifty USB

Type A to USB-C/USB Micro-b—it’s a single cable in which the

USB-C plug end is really an adapter with a plastic tether you can remove, revealing Micro-b for charging nonApple smartphones and other devices. The battery measures 6.3 by 3.2 by 0.8 inches and weights just over 14 ounces. The company offers an 18-month warranty.

The only quirk of the battery is that its sole button, when pressed, interrupts charging for a fraction of a second to check its internal

PROS

• Charges USB-C devices at up to 40W.

• Continues to charge while Mac is in active use.

• Recharges at up to 45W.

• Includes combo USB-C/ Micro-b to Type A cable.

CONS

• Doesn’t include high-wattage charger.

PRICE

$79.95

COMPANY

ZMI status. It’s not a big deal, but it’s a little odd, and something I haven’t seen with other battery packs. The battery can be switched into a USB hub mode by double-pressing the statuscheck button, which changes a status indicator LED to blue.

BOTTOM LINE

Fast, compact, well-designed, and a good bargain, the Powerpack 2000 battery is on top of the pack. It’s a great battery for on-the-road use. ■