Backup Extend

The Backup Extend is a portable battery designed for situations where one charge cycle isn't enough. It works as a standard power bank when you need to charge a phone, tablet, or other USB device away from an outlet, but it includes pass-through charging that lets you refill the battery while simultaneously powering a connected device.

The unit charges via USB input and delivers power through USB output ports. When you plug it into a wall adapter or other power source, any device connected to the output continues charging while the internal battery rebuilds its reserve. This means you can run a single cable to the wall and keep both your phone and the battery itself topped up overnight, or during a work session, without needing multiple outlets or a charging sequence.

BioLite builds this for people who move between powered and off-grid environments. The form factor is compact enough for a daypack or glove box, and the capacity supports multiple recharge cycles for most smartphones. The pass-through feature addresses the common friction point of portable batteries: the choice between charging your device now or saving battery capacity for later.

The Backup Extend uses standard USB connections, so it works with the cables you already carry. No proprietary adapters or brand-specific requirements. Charge it from a laptop, a car adapter, or a wall plug, and use it with anything that draws power over USB.