Extreme battery life on super old laptop

I got this dell inspiron 1501 about a year ago now from a thrift shop and I just recently got the charger to test the battery that came with it. I got batteryinfoview and realised that it reports the battery of having a capacity of 727 Wh, which is over 13 times what the rated capacity is.

I charged it to 10.4 percent. The battery didn't feel warm, but I unplugged it at 5:27 pm. It is now 7:04 pm and the battery is at 2.6 percent. The os is windows 7 64 bit with classic theme.

Let me know what you think of this