More info. What kind of car ?
Battery may be on way out
first of all if you have a good battery and im not saying you do but it could be fuel or air intake, your starter, or loss of compression.. but to test a battery you have to check it before you start your car then get someone to crank it and test it again because all battery will keep a surface charge but they loose that once a load is applied
sounds like a fuel or air problem change the fuel filter and air filter first also could be sensor or wiring fault
It could be poor battery connections, the starter,
your battery is flat you need to get your battery and alternator checked a lot of parts stores and garages will check them for free
My son has a rockfighter and he gets over an hour from the battery before it starts to go flat.
A battery charger does one thing. It charges a battery, and starts with whatever charge is in the battery and goes from there. Running an automobile battery down will shorten it's life.
Most likely it will not be the alternator. It sounds as though the alternator is working very well. It will be a faulty battery or a battery drain due to something left on or shorted out. Usually a boot light or glovebox light or recently fitted stereo.
Ignition switch is going bad. Will have to replace it. Because eventually the truck will not restart at all.
Connect the positive cable to the positive battery post on the donor car and on the Corvette. Connect the negative cable to some metal part of each vehicle, such as the engine. Be careful of the fan blades on each car. Let the donor car run for approximately 15 minutes to put a slight charge in the battery on the Corvette before you attempt to start it. Start the Corvette and as soon as it starts disconnect the battery cables.
If you have a 2003 Trailblazer which takes 5 minutes before it starts, there could be a problem with the remote start or the ignition switch.
Patients with CVS often feel pain in the abdomen a few minutes or hours before the vomiting starts
The average adult can survive without oxygen for up to about five to ten minutes depending on the condition that they are in.
The battery "starts" the car...after that the alternator keeps the battery charged. They work together in other words.
If the check engine light is or has illuminated, check for codes.
I was taught by my priest as an altar server that they are supposed to be lit ten minutes before mass starts.
The computer may have forgotten how to maintain idle speed. Unhook the battery for 30 minutes and then try it.