1. Find the Pack number for your APC UPS
   
Simply click the APC website link here to find out the battery Pack number such like "RBC3".

2. Check out the replacement battery in the quick reference table below:
   There are two brands - CSB and VISION for the options


Batteries for the RBC pack cross reference:

RBC1 battery only

2 x CP645

RBC2 battery only 1 x GP1272F2
RBC3 battery only 2 x GP6120F2
RBC4 battery only 1 x GP12120B1
RBC5 battery only 2 x GP1272F2
RBC6 battery only 2 x GP12120
RBC7 battery only 2 x GP12170B1
RBC8 battery only 4 x GP1272F2
RBC9 battery only 2 x GP1272F2
RBC 11 battery only 4 x GP12170B1
RBC 12 battery only 8 x GP1272F2
RBC18 battery only 2 x GP672
RBC 22 battery only 2 x GP1272F2
RBC 23 battery only 4 x GP1272F2
RBC 24 battery only 4 x GP1272F2
RBC 25 battery only 4 x GP1272F2
RBC 27 battery only 8 x GP1272F2
RBC 31 battery only 4 x GP1272F2
RBC 32 battery only 2 x GP1272F2
RBC 33 battery only 2 x GP1272F2
RBC 34 battery only 2 x GP672
RBC 43 battery only 8 x GP1245F2
RBC 44 battery only 16 x GP1245F2
RBC 48 battery only 2 x GP1272F2