Slow to crank after sitting for a few hours

My 01 has been pretty slow to crank after sitting for a few hours, but starts right up when it’s been off for less than 30 minutes. She recently sat for 3 months without the battery being disconnected, but started right up when I pulled it out of storage. Ran strong for a few days then started having trouble cranking after sitting. The battery is about one year old, I’m not too worried about the alternator being shot because it has no trouble cranking at a normal speed right after being shut off. It’s still sitting with stock starter and alternator, however it has a heavyweight flywheel which could be causing extra strain on the starter. Any help would be appreciated thank you.

 

What is the battery voltage before and during cranking when problem happens?

A strong battery shouldn't drop below 10-11 volts when cranking. If it's dropping down to 9 volts the battery is weak and should be replaced

It's also possible you have an intermittent battery drain with the key off. Do you have an aftermarket alarm installed?

 

Haven’t checked battery yet, doing that today, no after market alarm. I do have an amp and a small sub, those have been there for years though and turn off when ignition is off.

 

Batteries sulfate when sitting discharged, so its likely not in great shape. A slow charge or smart charger would be ideal but checking voltage while cranking is definitely the first step.

 

You can buy cheap load testers for battery’s. I have a top don I bout for like 30 bucks.

Also take it to your local auto parts shop and they’ll test it for free. As mentioned above letting batteries sit like that destroys them

 

lol, battery died overnight so couldn’t even test it until I got the charger. Was sitting at 10.7 so pretty shit. Got it on repair mode right now just waiting for it to be done to see if it actually holds the charge.