Have a older Cyberpower 1000AVR I got for cheap a few years ago. Worked fine all these years always hit the power switch before leaving the house when possible thunder, etc. can occur. Got home today and went straight into "overload". Unplugged everything still the same error. Hit the Reset in the back and it cleared the overload but it still won't power on completely. Where it I believe tests the battery when it makes the switch over sound during startup it dies for a split second and keeps doing the same thing over and over. Pretty sure its the battery but never had this happen. Amazon seems to have one cheap for under $40 versus a new small UPS for over $100. Thanks!