I am now 3 weeks out of surgery and I also have more pain at the battery site than I was expecting. I seem to tear the site if I bend too far forward, get in and out of the car wrong. It has been very uncomfortable to say the least.
I am hoping it calms down as I know from experience the inside takes much longer to heal than the outer incision.
It felt like the muscle had been cut, it has not been pleasant.
I hope this helps in your symptoms as they sound very similar.

Happy healing,
German Shepherd Man.