i had a brand new battery with 1015 CCA as tested off the shelf, out the door... the same battery, less then 4 weeks old, was testing at 715 CCA (nominal 900 CCA). replaced within 30 days, got another one... no problems since... in about 15 years of BMW ownership i've had DOA batteries more than enough, thus i do not trust a "brand new" batteries any more...

keep us posted