Does a battery with a too-large capacity for the vehicle cause damage?
MVS Forum member tjai had the battery in an S60 replaced with an 800CCA three years ago and has been experiencing electrical issues ever since including power seat operation and a/c flow. A mechanic explained that a battery with a larger capacity than is recommended is what is causing the issues as the higher
voltage causes the computer to have these “brain fades.”
However, this was erroneous advice. The voltage of a larger battery is not different than that of a smaller one. A larger CCA battery rating can only help your car’s performance, not hinder it.
My S60 had a 800ccc battery (replaced by AAA) and it’s been in the car for almost 3 years now. However over time I’ve had a few issues with computer of the car (Power seats not working, passenger side a/c not working; both these problems were computer/software related). The mechanic tells me that the battery being a larger capacity than the recommended is what is causing this issue in the car as the higher voltage causes the computer to have these brain fades, and went ahead and replaced the battery with an OEM battery. However on thinking back I am wondering would the car not have any voltage protection or surge protection preventing such issues with the computer? Is it that the computer starts having issues after years of usage or is it really the battery that can cause such problems.
Any pointers/comments/opinions would be very helpful !!