UPS
Uninterruptible Power Supplies
C I Corporation computers

amazon.com/Mighty-Max-Battery-ML3-12 $18

amazon.com/Back-UPS-550-Outlet-550VA-BE550R $28

amazon.com/APC-RBC114 $36
 

amazon.com/Mighty-Max-Battery-ML7-12-  $19

AmazonBuy $37

amazon.com/Back-UPS-550-Outlet-550VA-BE550R $28