Back UPS ES 550 APC battery surge charge back up protection

Back-UPS ES 550 Battery Backup System, 550VA, 8 Outlets, 365 J Used Good Condition. This APC does not come with the battery, battery needs to be purchased separately you could find these batteries on eBay or Amazon for around $30 to $50. My wife bought me a upgraded model so I’m selling this one. It works great and I didn’t really used it that much, has a lot of life in it.