Good post! Thank you. :)

I would like to add:

Be very cautious about using Lithium Ion batteries made in China.

There have been a lot of product recalls by major companies because of problems with poor manufacturing quality exhibited by rechargeable Li batteries made in China. My own lab had a HazMat incident last October caused by Chinese-made batteries that ruptured during environmental stress testing.

This goes beyond simple inconvenience. A failing battery can explode, with attendant risk of physical injury, plus the health hazards posed by lithium contamination and the poisonous gasses associated with such failure.