[08z4mroadster]

I've dead battery then replaced a new AGM battery. First week run and start like dream but second week I almost need to jump start my Z4MR every morning. I'd charged the battery over night but still need the jump start.

Do I need new starter? (But when I jump start the car start pretty good) or something else like something else. Seriously I've no idea now.

Anyone has similar experience here??? How can I fix it???

Thanks ALL~~~