Thankfully never had an issue with the USB battery packs or extra 18650s in a plastc battery holder.
Originally Posted by
Kensterfly
Yes, Lithium. According to your math above. and assuming you disregard all but the first three digits, My device is
Capacity: 18000mAh
Output: 5v/ 4A
So 90 wh. Though the box and documents show about 67.
Does that sound right?
The 67Wh figure is probably for the 5v output. I've read depending the quality of the LiIon cells are and how efficient the boost converter is you'll lose anywhere from 20-40% of the cells' rating when boosting the voltage from the nominal 3.7v to 5v.