I have a 2007 with 16K miles on it. I am sure the installed battery is not the original so not sure of its age being the second owner with incomplete service records. When the car is not in use, it is always on the battery tender. After using the car and putting it back on the tender, it usually takes about 9 hours to come back to full charge (solid green light). I am wondering if this is a normal state of affairs. Also could the car be off of the tender all day (for instance when at work) without risking the battery doing down enough to cause communication/programming errors? I plan on replacing the battery in the spring, but until then, it will be hibernating in the garage on the tender. Am I tempting fate or am I in safe territory?
Anyone with any advice and insights? I would greatly appreciate them.