Just because the label SAYS that does not mean "it is." It could be bragging, or it could be defective.
Procedure...........Charge the battery
Look of "leaks" that is leakage current when parked.
Pull battery and have it load tested.
Use same (load) tester to obtain starter current draw
As always, clean clean clean connections, and replace any suspect cables.
Last measure running battery voltage. Warm, with battery "normal" charged, voltage should run 13.8--14.2, in no case below 13.5 above an idle and in no case above 14.5
