I have an APC Smart-UPS 3000 XL battery backup. In addition to the internal batteries, it has a connector for adding an external battery pack to it. While it's available on Newegg for WAY cheaper than ...

Editor’s note: This article is part of our roundup of USB-C battery packs. The simplest way to discuss electrical power is in units of volts (V), current measured in amperes or amps (A), and watts (W) ...

For DIY enthusiasts in the green energy community, homemade lithium-ion battery packs have long been a holy grail. For everything from home solar energy storage to garage-built electric bicycles, ...

Universal Serial Bus Type-C (USB Type-C) provides high data-transfer rates and a reversible connector that the user can plug in without the need to check the orientation of a cable. Power Delivery (PD ...

is a former senior reviewer who worked at The Verge from 2011 until May 2025. His coverage areas included audio, home theater, smartphones, and more. Battery packs (also called power banks) are an ...