Jetspud,
It might be advantagous for you to read the treatise on lithium-ion battery charging and discharging on the following site:
www.batteryuniversity.com/partone-12.htm

I found it just by googling "lithium ion battery charging".

Never allow a li-ion battery to go below 2.7 volts, or it will not accept another charge. Li-ion batteries do not require cycling.

Read the "Hints to long battery life" in this article.