Confusing startup issue

[Krl]

I have a 2008 Jeep liberty sport, I recently got a new starter in it, but the other day I drove the vehicle to a family members house and when i got there i went to move the vehicle after i parked it and when i went to start it up it struggled a bit and when it started it sounded terrible, i turned it off and restarted it and all was fine. now about 4 days later i keep driving it and it sounds like its struggling to start a little bit, it starts off sounding fine but right before it turns over it sounds like its starting to struggle to start just a bit.

I have no idea what it could be and dont want to take it to my mechanic if i dont need to, any insight would be very grateful

 

[HoosierJeeper]

How was it before the starter? What kind of starter is in it no?

 

[LibertyTC]

Struggling to start, ensure battery connections and starter cables are clean & all tight.
Jeep needs good cranking amps so for piece of mind, get the battery load tested. How old is the battery?
57333[/ATTACH]"]

You must be registered for see images attach

While not running, with a VOM test the battery voltage, what is the voltage reading?
Once Jeep starts, what is the voltage reading then?