APC Back-UPS 500 - 6ft, AC 120V, 50/60Hz, 300 Watts, 500VA, 480 Joules, Hot-swappable, LED Status Display, 6x NEMA 5-15R, USB, Black - BK500BLK at TigerDirect.com
How to Permanently Disable the Beeping Alarm on an APC Back-UPS ES 500 Battery Backup - Share Your Repair
APC Back UPS CS 500 VA Offline Tower BK500EI UPD New Battery | eBay