The 301176 looks to be a proto 2 with the 5 volt board.
Those 5 volt boards had difficulties . Gunrunner John and GGG and others would have some ideas . All I could say now is the battery should be new and fully charged. 🤔 If you go to the MTH site for the 30-1176 press on the support section to bring up the manual for that Decapod. You will find info on the battery care on page 14.
If you go to SEARCH in the three lines at the top left menu you will find more info on the 5 volt board issues.