Acceptable replacement batteries (F2 connectors should be specified):
China Storage Battery
CSB UPS12540 (acceptable)
CSB HR1234W (preferred)
CSB HRL1234W (premium)
GS Yuasa battery
GS battery PE12V7.2 (acceptable)
GS battery PX12090 (preferred)
GS battery PXL12072 (premium)
There are also other manufacturers who make suitable replacements
including Panasonic, Enerwatt, Sterling, etc. If you look to
manufacturers other than the two listed above, make sure that you
specify the batteries should be the "High Rate Discharge" model
rather than a regular "stand-by" model.