Re: APC Smart-UPS float voltage experiment



Well, here I am, about 2 months later after replacing both batteries again, and they are cooked. I have 7 of these smart ups 1250s and the last 2 battery changes in two of them result in less than 3 months life. 13.84v charging v on the negative side has to be cooking these things.

Any ideas how to lower the voltage?...

Re: APC Smart-UPS float voltage experiment

Hi,
I'm new here as you can see. I ran across this page through Google after popping open my Smart-UPS 1250 and noticing the negative post all messed up, both batteries bulging and leaking. I used to get at least 3 years , but last few are only lasting 2.5 years and show signs of overcharging.

I looked at the max charge voltage on the box of the new 20ah 12v replacements and it says "13.8vdc max" so I put a digital meter on each battery. The one off the positive charge wire was reading 13.64 and the one off...