Nothing wrong with internal (LiPo) Mods... my new Innokin Kroma Z has internal 3000 mah battery... at 16 watts, it last a long time (and type C) My first "real mod " was an Innokin EZ Watt (35 watts) and I still use it as a carry around ( battery is still working, fire button has been used a thousand times and that poor thing still works)