Battery is functionally "dead" @ or < 11.9 volts.
If battery < 11v can be bad or need charging at low rates... rates of 6 to 10 amps Max taking an hour or more.
If battery is charge to 12.6-13v and stay there discon to anything then likely good...
If still won't start can be battery cables, starter motor or other things.
See my Cave, Battery
Starter motor, solenoids and iffy cables can heat up fast and die for that heat when abuse like the statements above.
Starter motors and solenoids have 1-2 minutes Max On Time then need 20-30 minutes or more
Off Time to cool down.
Case of these maybe warm to hot doing that but inside the coils and other parts are way hotter and can start "burning" the wire insulation.
⚠️ When replacing starter, replace battery cables too. Cable may look ok to you can be dead and have big problems carrying 100-200 amps.
Most starters draw 120-150 amps to run If everything is good
... Crap cables and more make starter draw more amps.
See my Cave, Electric Motors
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave