Hi, the red top 45 in my car isnt charging.

The charger thinks its a 6v battery and as such says it s full. It is indeed at 6v. Maybe I've left it to long before attaching the charger.

Whats the best way to get round this or is the batterry goosed. Its 4 years old now and only needed charging once before, this time last year.

What type of charger are you using? If its a modern intelligent one, might need to give it a quick charge with an old fashion one first