· Two batteries provide nearly as much life as a three s The is not really more expensive when viewed in these terms They provide a third more battery life and cost about onethird more This is not too surprising The lithium ion technology is the same The difference is the sizeI tested the lumen output with 30T, 40T, 50E and Shockli 5500mah and there was almost no lumen difference on turbo I would use the Shockli in my FT03 but it's in my D4S, I'm using the 50E 5000mah in the FT03 That being said the FT03 XHP50 may have different results level 2 74orangebeetleFree Battery Case is included when batteries are bought in quantities of 2 or multiples of 2 (Example 2, 4, 6, 8, 10, etc) On Sale Description Description New rechargeable battery high capacity high drain cell from Samsung INRE FREE battery case included with each pair of batteries (2 batteries = One Free case) Pin On Batteries 21700 size