I have an unusual problem I hope someone will be able to help with. Only use my 350z roadster when the sun shines so not much recently. Replaced battery 9 months ago but when I go to the car to start after 7-10 days all the dashboard lights come on but the engine won't turn, I get a clicking noise and the dashboard lights flash a bit. If I attach jump leads the car starts first time? Volts on the dashboard shows 15? Is the battery on its way out?
Any help greatly appreciated.