Any good auto parts will check your battery for you especially if batt is over 2 years old the internal plates can crack or wear out and will hold a partial charge for a few daws or less ==check all the obvious such as add on equipt over head or floor lighting [ if windows are tinted you wont notice them eaisly] check hood and trunk lights they operate on mecury s/w and only turn off when you close them====if you cant get to an auto parts a simple test if youhave time disconnect batt for a few days if it is weak or dead then you need a new one

