Also these brands are just using off the shelf batteries anyway (eg: a Cyberpower model using two 12v/8Ah SLA batteries connected together[1], with various OEM

Also these brands are just using off the shelf batteries anyway (eg: a Cyberpower model using two 12v/8Ah SLA batteries connected together[1], with various OEM brands seen on the labels). Searching online discussions one finds which OEMs make better quality batteries. [1] One such example, replacing with a generic kind: https://www.youtube.com/watch?v=R6qcon76i4s https://www.youtube.com/watch?v=R6qcon76i4s