Replaced with new battery still wont start what do I need to check

Do a load test on the battery - probably needs replacing.

car wont crank or car wont start? I would say your battery cables are bad,, acid gets in from battery and erodes internal cable parts... need a Meter to check it out.. put the meter on battery while someone tries to start it, if the voltage drops from 13.5 to 10 then it is trying to turn over, I always have the new starters tester before I leave a store, they are remanufactured in Malaysa and they use old parts in most of them..

Since you give no make , model or year of vehicle, I will assume it is fairly new if it has a battery saver feature. New cars are programmed to shut down non essential components to conserve power to start a vehicle that has marginal voltage to start the engine. Seems your battery is dying and your car is warning you that it may not start if the problem is not attended to ... Have your electrical starting system checked. Battery alternator, and load check.. Replace battery or alternator if needed.

Check connection to starter. Might need to replace starter. I'd start by checking connection's and make sure tight.

I'd check for bad or corroded contacts/cables from battery to starter (If your vehicle is older than 14 years). If that looks good I'd be suspicious of the solenoid in your starter sticking(will probable need a new starter).

Check the starter

maybe check you are getting around 14volts on your battery when car is running [alternator check] how old is your battery? check voltage at battery whilst trying to start maybe your battery needs replaceing

check fuel pump, fuel filter

dead battery, starter, or selenoid. I would start with checking the battery.

Check your starter motor, sounds like a dud winding in it. Then starter reeds to be overhauled / replaced.

Can you bump start it or is auto? If it's a stick shift you can try to bumpstart it, if it starts then its a good chance that the starter is fried.