I bought replacement batteries for a Tripp-Lite UPS. It turned out they were the wrong batteries, but they fit another Tripp-Lite UPS that I own, so I decided to keep them as spares. A Tripp-Lite tech person told me I should charge them at least every six (or was it three?) months to keep them from deteriorating in storage.
Eighty days after I received the batteries, I installed them in my UPS, to charge them, and found them to be, apparently, dead. I called Tripp-Lite, and after some unsatisfactory interactions with first-tier tech-support people I reached a manager who was easy to deal with (returned my calls and emails) and agreed to replace the batteries as a warranty item. When I installed the replacement batteries I found them also to be, apparently, dead and contacted Tripp-Lite again. They didn’t have any new suggestions, but I suspect they would have replaced the batteries again if I had insisted. However, I did some fiddling and found that the problem was not the batteries at all but a loose connection on a wire that connects the batteries to each other. This was easily fixed with pliers, and now both sets of replacement batteries work.
I wasted more time on this problem than I should have, but the outcome was essentially good. While Tripp-Lite’s tech support is a bit rough around the edges, the people I dealt with, and particularly Joan Smith, the manager, sincerely attempted to resolve my problem. (I don’t know how frequently such problems are caused by loose wires, but I suspect it is not often, and I am not sure it is fair to expect Tripp-Lite’s techs to suggest such a possibility. Their fallback suggestion to me was always to test the batteries using a voltmeter, which makes sense except that most customers, if they are like me, probably don’t have voltmeters.)
So, on the whole, a satisfactory resolution. My impression has always been that Tripp-Lite’s products are well designed and good values as compared to alternatives, and I have bought them on a number of occasions over the years. After this experience I will not hesitate to buy them again.