On many vehicle its recommend to have a good battery and have it tested on each oil change. And just so you know we test and check your battery on every oil change which comes with a free complementary 36 point inspection. If your vehicle has bad or low battery charge can cause many issue some can trigger check engine light\service engine soon. It also can wear down the starter and alternator which can be costly. And most of all it can be inconvenience to you so always have your battery tested and make sure your battery is good.