Batteries have no set time for replacement. They can last from 2 to 7 years. Change it at the first sign that it is weak or will not start the engine.
You should only change it, when it goes bad.
only need to change a battery if the battery is not holding a charge suffient to start the engine
It should be done once a month
As soon as the detector indicates a low battery, otherwise once per year.
Read your owners manual.
It deon the battery type.
How often should you change the fuel filter?
A battery can last from 1 year to many years. You change it when it no longer will start the car or when it no longer will hold a charge.
Well you should charge the battery. Often times the battery will recharge itself if you alow it to sit without trying to crank it again.
as often as needed
it doesn't really matter. if your battery runs out fast then you should charge it a lot.
You should only recharge it when the battery gets low.