By Check Out Bofa
Stock 2020 Civic EX Hatchback, 60k. - I replaced the original battery 3 weeks ago, got an OEM spec battery from Autozone (about $220) - Today, the car was completely dead. Busted out the multimeter - 3 volts on the battery. - Jumped the car, tested the charging current - 14.5v. So the alternator is good. - Open circuit voltage: 12.45v - Serpentine belt looks good, tension is good - Have not checked the terminals on the alternator None of the lights were left on, doors closed. Car is... New Battery --> Died 3 weeks later