APC BR1000MS 1000 VA Pure SineWave Back-UPS Pro Battery - Newegg.com
APC UPS for Gaming, 1500 VA Sinewave UPS Battery Backup with AVR and (3) USB Charging Ports, BGM1500, Back-UPS Pro Uninterruptible Power Supply - Newegg.com
APC UPS BR24BPG Back-UPS Pro External Battery Pack for 1500VA Back-UPS Pro - Walmart.com
APC UPS Battery Replacement for APC UPS Model SMT750 - Newegg.com