I have 2 UPS’ that have expired batteries. The manufacturers want crazy amounts of money to replace them, and a friend recommended I look online to see if I can get them elsewhere. However, the sites all seem so sketchy. Have any of you had good luck with third party battery sites? Obviously a bit nervous about safety.
I’ve bought some brand called MightyMax on the rainforest site for replacement UPS batteries They work good. My friend who works IT swears by them to recondition old APC Schneider units.
Generally cheap sealed AGM lead acids are a lot safer than cheap lithium, the chemistry is simpler, harder to fuck up and the internal safeties are mechanical, not BMS based. Thry may have slightly lower capacity than a name brand cell but for emergency backup when home labbing it won’t matter.