Update after using the SMY SDNA 75 for a few days...
A 25R lasts me through 2 tanks of an EHPro KFL Plus v2 w/KF Monster v2 base (over 9ml of juice) w/the settings I use- which are admittedly rather mild (0.06 ohm Ni200 coil, TC 'Boost', 30W @ 445º F, all else default, which is to say the mod’s in “buck” mode, not “boost”). When the screen indicated 3% battery left (battery icon was empty) I pulled it, it showed 3.33v (default cell soft cutoff is 2.75v). The vape was virtually unchanged throughout the cell discharge cycle. Escribe’s statistics shows the actual battery run time was 24.5 minutes.
As a frame of reference, the battery run time of my VTC Mini- using similar TC settings and coil resistance- is around 25 minutes (3.2v battery cutoff), my smok treebox (3.5v battery cutoff) runs for just under 14 minutes.
Bottom line and/or TL-DR: No problem w/battery run time for me.