The Interstate MTX-48/H6 is part of the Car Batteries test program at Consumer Reports. In our lab tests, Car Batteries models like the MTX-48/H6 are rated on multiple criteria, such as those listed below.

Life: How well a battery withstands repeated charge-discharge cycles in high temperatures. A higher score means better reliability and voltage retention over time.

Reserve capacity: How long a battery can power a car if the charging system fails. A higher score reduces the risk of failure if accessories are left on.

Cold Weather Performance: A higher score means more reliable cold starts. This test measures voltage after 15 and 30 seconds of cranking at 0ºF, using half the average claimed CCA, or Cold Crank Amperage.