If the battery checks OK, then it could be corrosion (even after 3 years) either at the battery terminals or at the other end of those heavy cables.
Remove your negative battery terminal first - ALWAYS. Then the positive.
Clean them both with a wire brush or terminal cleaning brush.
If it still turns over too slowly, you will need to remove the negative battery terminal, then from under the vehicle, remove the other end of your positive cable from the starter terminal and clean both the terminal and the cable end; reattach.
With the negative still disconnected, locate the other end of this cable (may be on the engine block or bolted to the chassis sheet metal) and, there will be an additional cable that connects the chassis to the engine block or vice - versa.
Clean and reattach these.
Finally, reconnect the negative cable to the negative battery terminal.
When I go through this routine, I use either dielectric grease or a least petroleum jelly smeared liberally on each of the mating surfaces before reattaching.
If it still turns over slowly, the green eye is lying!
Once started, you can go to any of the larger chain auto parts stores and they will test your battery free.
Testimonial: "I tried to clean the battery + and - terminals/cables and hope it will be started better tomorrow morning. If not, then I will do the 2nd step. "
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