Replacing an APC UPS battery pair labeled CP1290 12V 9AH.
The unit has two confusing labels: on front is XS1500 and on back is
BX1500. Was this a transition unit, insides BX1500?

Need recommendations of battery brand and type.
Battery type includes high temperature batteries.
Is this a better battery overall?

Buying batteries from Amazon.

Batteries in the unit are swollen and cracked but not leaking.

They are fastened together with a cable coming out between the to
batteries that are mechanically packaged top to top.

Not sure if I can easily get apart and reuse that mechanical setup.
Suggestions please.

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