The term refers to an energy storage device that can also bear weight as part of a structure—like if the studs in your home were all batteries, or if an electric fence also held up a wall.

Batteries aren't a one-size-fits-all product. The EP900 system is a solid option for your home, but it might not be your "best" option. Another battery might suit your home and individual energy ...

All batteries slowly wear out and lose some of their energy-storage capacity over time. For instance, your phone battery holds less of a charge after a few years than it did the day you bought it.