Help po, may battery kami Motolite Gold. 2 years na pero minsan lang nagagamit, pinapaandar lang sasakyan every 1 week tapos tinatanggal yung positive side after. .then nasiraan kami alternator pumutok diode ayaw magcharge. .then nung naayos na alternator nagchacjarge na battery, reading ay 13.1 v right after tanggalin yung positive side. .pagkabukas nagdodrop na to 10.5 volts pero nakakastart pa sya, cranking volts at 7.4v. Bakit kaya nasira battery eh minsan lang naman nagagamit yung sasakyan? Any inputs or suggestions sa experts jan?