Battery buyers are being warned: a bigger amp-hour number does not always mean a better battery. An ampere-hour, or Ah, measures electric charge over time. A 10Ah battery can theoretically deliver 10 amps for one hour, or 1 amp for 10 hours. The formula is simple: Ah = current × time. But in real li

When used according to the manufacturer's directions, jump starters are perfectly safe and an incredibly useful tool to have on-hand in case of a dead vehicle battery. You won't need to call and wait for roadside assistance to come to you or flag down a passing vehicle to ask for help jump starting