Originally Posted by
T Stew
15,000mAh seems almost a ridiculous amount of battery though. I use a usb power pack (the cylindrical ones that takes 18650 cells), if I brought two of my Panasonic ncr18650b batteries (3400mAh each) I figure I could get around a weeks worth of full day GPS tracking plus some other light phone usage. With no other charging along the way I mean.
Its a lot, but it was what was on sale and available. I was using it to charge a phone, GoPro and camera battery when needed. Having dealt with cheap electronics, I didn't trust ratings so much and upsold myself, but it seemed to hold a realistically close charge to its claims.