We have a large Riello UPS MultiSentry with two battery compartments. It came with second hand batteries (Yuasa SWL3300FR) which over 25% of which have come off the pallet with cracked exteriors. It looks like the cells have expanded inside and caused the cracking. I'm wondering if anyone here has experience with UPS batteries and know's why such a large number might have failed? The batteries claim to be good for standby use and have long life... so we're a bit confused why so many have failed. And unsure whether this means the entire batch is likely to be bad
I've included pictures of damaged units


I've included pictures of damaged units

