Does anyone knows or use this App called "Battery Doctor" and if you, is it safe and accurate in terms of what it checks and it's intended to do for you? :
Battery Doctor icon by charhen on Dribbble
Battery Doctor Ltd - WhoCanFixMyCar
Amazon.com: WirthCo 1213.1241 20092 Battery Doctor 125 Amp/150 Amp Battery Isolator , Black : Automotive
Battery Saver - Super Cleaner - Apps on Google Play