Want to know if you have the Samsung or TSMC A9? Simple. Download BMSSM, touch the SYSTEM tab and look under DEVICE for MODEL. If there is an "M" in there, you have the TSMC A9. If not, it is the Samsung. For example, my 6S with the TSMC is N71mAP. If it were a Samsung, it would say N71AP. The same applies for the 6S+. N66mAP is TSMC, N66AP is Samsung. Does this matter to most people? Probably not, but we have the right to know. Personally, I don't ever fall below 30% battery in a day, and if I did, I have portable chargers as well as a cord in my vehicle.