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A rechargeable device most often made of lead plates covered in an electrolyte and protected by a plastic shell which supplies consistent electrical energy to a motor vehicle. Often referred to as an SLI battery (starting, lighting, ignition). Powers starter motor, lights, and ignition systems of a motor vehicle.

5 votes
2 answers
11k views

What do professional battery testers actually measure?

When a garage hooks up their battery tester what does it actually measure and how does this differ from tests you might perform yourself with a volt-meter? … For example, recently a garage measured my battery and said it was bad because it scored "around 40" when it should have been "around 80". …
4 votes
2 answers
89k views

When reconnecting a battery, why connect the positive first? [duplicate]

When reconnecting a battery, why is it recommended to connect the positive lead first, and the negative lead last? What difference does it make if they are connected in the opposite order? …