Define "good". What is the battery terminal voltage DURING CRANKING or at least attempting to crank? If it goes extremely low, the battery is bad. If there's little or no drop in terminal voltage, there's a dirty connection somewhere- - - -fix it. Try turning the headlights on, then attempting to start the engine. If the headlights go out, there's a dirty connection at one of the battery posts that won't flow starter current. Even a failing battery will show normal voltage with no load on it.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!