The engine does not crank or cranks very slowly
You hear a clicking sound when turning the key
The lights are dim or do not turn on
Electrical accessories stop working
The battery warning light is on
The battery case looks swollen or damaged
There is corrosion on the battery terminals
The battery is older than 3 to 5 years
The car needs frequent jump-starts
A multimeter shows a very low voltage
The battery cannot hold a charge after charging
The engine starts after a jump but dies again soon after