RPMs go up when slowing down ,only when the AC is off

[socalfc3]

Hello, I’ve recently noticed that when the air conditioner is off and I’m slowing down in neutral my Rpm’s will slowly decline and when it hits 1k it goes back up to maybe 1300-1500k until I come a complete stop then will resume to go down to normal idle rpm . Like I mentioned it only happens when the ac is off , when it’s on it runs normally , and I’m wondering if anyone has experienced this ? I’ve been told it might be because my battery is dying and the car is trying to rev a little to charge it. I’m testing the battery tomorrow morning but just curious what youguys think! Thank you guys

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