Car batteries

What's behind our car battery Ratings?

• Overall score
  Overall score combines life-test performance, reserve capacity, and cold-cranking-amp (CCA) performance in our tests; scores are relative to others in their group sizes.
• Life
  Life test measures how a battery endures repeated charge-and-discharge cycles at hot-climate engine-compartment temperatures. The more cycles endured while maintaining a higher voltage, the higher the score.
• Reserve capacity
  Reserve capacity estimates how long batteries can run a car if the charging system fails.
• CCA
  CCA performance reflects voltage at our load of half the average claimed CCA for each group size after cranking for 15 seconds at 0º F. We charged batteries at the 14.5 volts that vehicles typically supply, rather than the higher voltage that manufacturers use. Batteries charged at the lower voltage met BCI voltage standards for a fully charged battery.