search for: 35ah

...n fuses, loose connections, anything visually obvious, but found nothing. The old batteries measured 12.x volts each and the new batteries measured 13.x so I don't think I got a bad battery. I replaced with the same batteries I'd used in the past: Duracell SLADC12-35J Deep Cycle AGM SLA 12V 35AH; the last set lasted 7 years. Tripp-Lite considers these batteries to be non-user replaceable, likely because they're bolt on and opening the case is a bit of a chore. It's a well built unit though. The UPS has a system enable switch on the back and a momentary on/off switch on the front....