Goal Zero Tank Pro 4000

short Build out your backup system with powerful expansion batteries. You can combine as many as 4 Tank PRO 4000 batteries per Yeti PRO. This creates a robust backup system that can run essentials in your home for days on end. And because the system is modular, you can get the expansion batteries you need now and easily add on more in the future when your needs change. box1 TANK PRO 4000 HIGHLIGHTS Modular Scalability Not sure how much power you need? Not a problem. Get one or two expansion batteries now. When life changes, the modular design makes it easy to add more power. Increased Capacity The Tank PRO 4000 has increased capacity over older models so you can power more for longer. Since it’s easy to add on more expansion batteries, you can get enough power to keep your home running for days on end. Easy Integration The Tank PRO 4000 nests snugly with the Yeti PRO 4000 to build out your home backup system. Once connected, the two devices function as one unit and charge and drain tog