Free Battery Testing at Batteries Plus

Batteries Plus tests car batteries and charging systems free, and the reason to use it is diagnostic rather than promotional: a car that will not start has at least three plausible causes — the battery, the alternator, or the starter — and they are frequently misdiagnosed as each other. Replacing a healthy battery because the alternator is not charging it means doing the job twice. The test reads both the battery's state and whether the charging system is actually delivering, which separates those cases in a few minutes. Worth doing before winter regardless, since cold weather is what converts a marginal battery into a dead one. No purchase required.