Battery Failure Causes
6 Nov 2014 This is an update to my post regarding monitoring your battery. After 2 weeks, we got our C-Max back from the dealer after our first battery failure. Our Cause: 1. The Dc/DC converter that charges the battery seems to have failed and was replaced 2. The battery was dead and was replaced 3. They could not get the proper 14.4+ volts across the battery. They were getting some where near 13.5 V Cause: Replace a high power/amp fuse with the heavy cable. After the fuse was replace
Just an observation...I think the 3 failures you list are related. I suspect failure 3 occurred first (and is something I have not seen reported in this forum yet). This high impedance wiring/fuse short most likely stressed the DC/DC converter components, causing it to fail. DC/DC converter's failure ultimately caused 12V battery failure. The 14.4V charge level you are now seeing is about right, The 12V resting voltage (with car off) should be 12.2 - 12.7 (= 50% to 100% SOC). I place my 12V batt