Once you put a new battery in your car you generally are good to go for three to five years. Apparently, with all of the demands that consumers are now putting on their car batteries,they now are being replaced at a much faster rate.

‘A steady increase in the number of electrical accessories in the average car is shortening battery life. As vehicles are now being designed to operate more systems, they still use the same basic type of 12-volt battery that has been in use for decades.

In the past decade or so cars have evolved from basic transportation to something resembling dens, kitchens and offices on wheels, with everything from DVD screens, subwoofer sound systems and mood lighting to built-in refrigerators and cup holders that heat coffee and cool soft drinks. The automotive aftermarket also offers an ever-growing range of gadgets that help multitasking drivers and passengers talk, eat, find their way around and get their work done on the road.

For consumers, the proliferation of onboard electronics means increased comfort, convenience, efficiency and safety in the form of computerized engine controls, tire-pressure sensors, and powerful navigation and entertainment systems. The downside: All these power-sapping accessories — coupled with vehicles’ increasingly complex networks of electronic-ignition systems, pollution-control devices, security systems and display screens — could be helping to drive up the death rate for car batteries.

Even parked cars are using more juice than they used to. It isn’t that owners are simply forgetting to turn off the headlights, or leaving their cellphones charging overnight. There are many electronic devices in today’s vehicles that continue to draw power even after the ignition is turned off.”
(Source)