I think your OP autocorrected but is it the COIL art Mage Tricker you got?
If so, be sure to watch
THIS VIDEO. He's a great reviewer and he goes over some issues specific to that
mod, or possibly issues specific to one of the color options of the
mod. It's possible one of those problems is causing the low run time, but it does seem to be something else.
Where did you buy that battery? Authentic Samsung 25Rs are great
batteries but there are a lot of fakes.
Personally, I only buy from IMRBatteries or LiionWholesale. There's at least one other big battery seller that people really like who I'm not thinking of right now.