We have an APC Smart>UPS 2200 XL and I have already ordered two different batteries that appeared to be compatible with it and they are way too big. Our unit has a long sealed metal box with a bunch of smaller cells in it but the APC battery finder keeps sending me to the RBC55 which is huge.
SUA2200RMXL3 is the model number
J50644012900 is the serial number
any ideas? The open box is what came out of the unit, the battery on the left is what the battery finder recommends. 