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