CyberPower LE850G UPS Battery Backup with Surge Protection $59.99 shipped @Costco
https://www.costco.com/.product.100519
- 850VA / 460W
- 12 Outlets / USB Port
- Simulated Sine Wave
- Line-Interactive Topology
- 5 Foot Cord Length
https://www.cyberpowersystems.com/product/ups/battery-backup/le850g/?
Replacement Battery Cartridge: RB1270B