The guy tested knew what I've been looking for. On the web, click on the followings, especially on the water test:
. Kayak Fishing Supplies review
. Sussex Kayak Fishing Forum review (in the shop)
. Sussex Kayak Fishing Forum review (on the water)
Let me know in a week advance. I am available Saturday and some Sunday. At this point, I don't have a good way to keep the the battery inside of a x-13. I use 7 amp SLA battery inside of a water proof box. So, installing a 6" hatch will not work (I don't even think there is a place wide enough for a 6" hatch on a x-13.) So I may have to keep the battery box outside of the kayak between the bow well and the beginning of the Center console (behind the fish-finder). See if you can figure out how to keep the battery inside.
I think the designer of x-13 forgot about the battery. Also two recessed rod holders in the efront should have been optional. They are useless (not reach-able) for single kayaker.
I am planning to stop by the shop soon to see a x-13 again.