alfa 147 strange flat battery
Hi guys i would very gladly appreciate if i could have a pick of your knowledge
i went to start my car this morning the battery was flat so i jump started it off,
took it for a run for 10-15 mins to get abit of charge back in, i then stopped off to get my hair cut went back to the car when i had finished and it started fine,
thought id better take it for a good run went on the motor way for at least 30 mins reaching speeds of 80-90mph
pulling off the motorway on the junction low battery warning came up, then all the dash started to go off , i got rather scared as i was with the missus and kids, so i put my toe to floor and managed to get home, turned it off tried to start it again and it was flat
worth trying a new battery ? but why did it start fine after been stood at the hairdressers and then play up after having a good run when i was pulling off motorway ?
would appreciate any advice please as i lost my job a while back with the stupid recession and things are quite tight , so i dont really have 40 pound to spend on battery if it doesnt fix it....... need your opinions please and many thanks