I run 8X power AA Lithium batteries in my SpyPoint IR-6 game cameras. I have not replaced the batteries in almost a year, STILL show as FULLY charged! Keep in mind that some cams will not recognize the Lithium batteries...
Case in point, my old StealthCams... Thinking I was onto something, I bought the battery conversion cases that snap onto the AA batteries but make them the diameter of a C battery... Installed them into my old StealthCams & they would not even turn on! But if I put the old cheap C batteries back in, it worked...
Cheers
Jay