I use a modified version of the Stealth external battery pack, modified internally by me, with no internal batteries, camera has been out and running continuously since November of last year. When you can get lithium batteries, which are junk when exposed to the Texas elements, to last and be this reliable, let me know.
You are going to introduce problems with your camera using lithium batteries, the quality is no where near the level a cellular camera needs at the price point they are offering and therefore, very unreliable.
Please keep the members informed of your results, but I will not be surprised if we never hear back about the reliability or longevity of the rechargeable lithium batteries.