Yes, battery-powered generators exist and come in several forms. The most common type is a portable power station—a rechargeable lithium-ion or lead-acid battery pack with built-in inverters that convert DC power to AC electricity. These typically range from small 100Wh units (powering phones and laptops) to large 5000Wh+ systems (running refrigerators, power tools, or multiple appliances). Popular brands include Jackery, Goal Zero, and EcoFlow.
Another category is solar generators, which combine battery storage with integrated or paired solar panels for recharging. These work well for off-grid use or backup power.
For backup power at homes, there are whole-home battery systems like Tesla Powerwall or LG Chem that integrate with solar arrays or the grid, storing energy to power an entire house during outages.
UPS (uninterruptible power supply) units are smaller battery generators designed primarily for computers and sensitive electronics, offering seconds to minutes of backup power.
The key limitation of battery generators is runtime—they store finite energy and must be recharged via solar panels, wall outlets, or car chargers. Unlike fuel-powered generators, they produce no emissions and require no refueling, making them safer for indoor use. However, they typically cost more upfront and have lower power output than comparable gas or diesel generators. Battery capacity determines both how long they run and what appliances they can power simultaneously.