2005 Jeep Liberty Limited 3.7L engine. Battery is 3.5 years old. 3 year warranty. If car sits more than 8 hours it won't start, makes fast click/zzztzzztzzztzzzt sound as if battery is going bad. 2 parts dealers tested the battery (not a bench test) said it is fine. Should I buy a new battery? Bench test would take time would rather not.
Put a meter on the battery with the engine off. It should be about 12.7 volts. With the engine idling, it should read about 14.5 volts. If not, you need a new battery, or a new alternator or both.
make sure your battery connections are clean and tight.
See FAQ for more troubleshooting.
It sounds like your battery is bad. Test the battery after it sits for 8 hours or overnight. New batteries do not last as long as ones made in the past, so 3+ years might be past its lifetime.
