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I ordered these batteries because my Cyberpower 1500 unit had become totally unreliable and was randomly shutting down my system. To be fair, I'd had it for a while, so I suspected that the batteries needed replacing. The seller shipped them promptly, but actually replacing the battery on the LX1500GU proved extremely difficult -- the terminal wires were so firmly in place that I ended up mangling them in the attempt to remove the old batteries. So now I have a dead UPS unit and new batteries that are useless to me but cannot be returned.
I could have got two rb1290 batteries from amzn for $66 but choose to get the assembly or cartridge for $90 a difference of $24 for nothing. I got ripped off -please don't just buy two of the rb1290 batteries a bit tricky to get apart
CyberPower helpline stated based off my units fault code it needs new batteries. I ordered them and installed. The unit still does not work. I called back and they said I need a new entire unit. Now it looks like I cannot return these batteries.