Please do not let this battery issue get you too upset. Trust me its not worth it. I too have been dealing with this problem for over 7 months now. I have found the fix for this. Getting a new battery is not it. Charging both batteries is the key to having full power when you need it. I too was going to replace my battery for the first time in this 4 year old car. This would not have helped at all know my car sits for days if not weeks at times. All I have to do is fully charge both batteries and then let sit. Check it once or twice a week for power. If your battery does take a full charge with no problem. Your battery is good as new. Not only do I have the power I need. I am now getting 601 miles to a full tank and charge. Not bad for a 12 gal tank. Its great to know because I will be driving to Las Vegas on the 28 May 2019 from Clifton Heights, Pa. 2500+ miles one way. This should give my battery a good charge for the money. Well I hope this helps. Take care, God Bless and best of luck with you C-Max Energi, Robert R. /U . S. Navy Retired