Lesson 2/Learning Event 2
When batteries are selected for installation in a vehicle, they should be matched. This applies to
both new and charged batteries. If two batteries with one weaker than the other are placed in a
vehicle, the vehicle's charging system will overcharge the stronger battery in an attempt to charge
the weak one. This causes overheating and loss of water in the stronger battery, shortening its life.
In matching batteries, you should pair batteries that have about the same specific gravity and
voltage.
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