Does leaving a lithium-ion battery uncharged for 3-6 months at a time hurt battery life? Does leaving a lithium-ion battery uncharged for 3-6 months at a time hurt battery life?

I have seen plenty of questions and articles about the dangers of leaving your cellphone in the charger, but I can't find anything about leaving your devices uncharged.
Yes, leaving a lithium ion battery fully discharged for long periods can destroy the cell's ability to hold a charge. If you are going to be storing batteries for a long time, leave them about half charged.