Battery goes dead

well the battery is now dead (or only discharged !)
cause #1 ALT/Gen replaces WRONG, see here 10,000 times. more www.

driving a car the ALTERNATOR produces all Electrical power.
100amps x 13v is 1300watts, and runs ALL>
when it dies the battery is sucked dry/dead/ discharged.

1; remove neg lug from battery or BOOM (100amp fuse BLOWN)
2; remove ALT
3: new one back connected same.
4: battery NEG lug back
bingo no BOOM.!
every SM manual of every car tells that;.

you said didn't want to start
but I guess you meant starter is dead, or clicks only or will not spin fast as it must.

the 15mins is dead accurate, for 50 years driving seen this happen
as ALT goes dead at night,
in the day engine runs 30min to 1hour dead ALT , HEADS off

the blow fuse is just bay fuse
or worse, a fuseable link, oddity not fun to fix. ever.
thus step 1,

no engine told but let me look on uSA car thjis.
2010 not AVEO5

there it is but what it looks like, hummmmmm

Check:
-battery - charge over night before testing
-battery connections
-a proper ground
-charging system (alternator) working
-rectifier
-short in wiring (bare wire somewhere?)

When you start your car turn your head lights on and see if they are really dim or your dash lights. Do it at night for better accuracy. If they seem very dim then it's you alternator.

IT costs nothing to have a load test done on the battery to check for a dead cell which your problems point to. While the engine is running the alternator will be handling the power requirement but the battery will not supply the power required to start.

your battery needs replacing

Might have 12.67 volts, but not enough amps to crank engine or light the lights properly. Try putting a charger on the battery, bring it to a full charge. Next, put a load tester on the battery to see if battery is weak or dead cell. If battery checks good, check the charging system. With engine running at idle, put volt meter on battery-read volts, then rev engine to high idle. Volts should climb higher than idle reading.

Could be a loose or dirty battery connection, poor battery, or alternator. Check all the cables and connections to your starter. Clean your battery posts. Have your alternator and battery checked. It sounds like you are either running off just the battery or just the alternator. One of them is not right.

yes my battery light started coming on my cougar and i checked the voltage with a meter and the battery is showing the right voltage. but when i drive at night the lights goes dim and then to bright again. so can you help

it does sound like you are having a problem with an alternator.

hi terk
check battery connections are secure if its been changed recent chances are its the live lead has not been fully seated on the cone prior to tightening