Went to start the car this morning, all the lights started flashing, all was well. Turned the key, and it cmpletely died

Switched it off again, it charged up a little bit, enough so that the lights started flashing again! Tried the horn, sounded like a clowns car
Eventually i gave up and changed the battery

Thats 12 years the old ones been on there now, it was hard to let go...

Was hoping it would see me through another year, no such luck

Funny thing is, i charged up the old battery overnight, and it was 13V, yet the new one is on less, i know the new one isnt very good, but still!