Dapat siguro automatic na iyan, so kung medyo mababa na voltage ng battery, mataas ang current, tapos, unti-unting bababa, kagaya nung ginawa ng kumpare ko para sa akin. D-I-Y na battery charger. I needed one kasi madalang ko magamit yung isang sasakyan, tapos 3 years old na yung battery, so i had to charge it from time to time.