Nope, other causes for battery replacement include:
corroded terminals, failed alternator/voltage regulator, and poor maintenance of the battery.
Note each of those has occurred on my vehicles but only the corroded terminals was with a PC installed I think they would have happened either way....
Master switch off.... works great. I have however left it on while in the theater for a two hour movie and the Suburban still started. The joys of a system that consumes about 30 watts.