It would be in everyones best interest if you make sure you know what you are talking about before posting. This just leads to misinformation being spread and newer users have a hard time differentiating fact from nonsense. Lithium polymer cells (and ALL forms of rechargeable batteries) can be damaged if individual cell voltage drops below a certain point. That particular threshold varies based on the configuration and kind of cell in question, so the same rules that you apply to sealed lead acid batteries cannot be applied to Nickel metal hydride batteries or lithium polymer batteries. All rechargeable batteries can be damaged by overcharging or overdishcharging. In the case of lipos, people familiar with the technology seem to agree that the load should be removed when the cell potential drops below 3 volts. You may or may not be able to revive a deeply discharged lipo, but regardless you are shortening the life of the battery if you do not follow accepted charging and discharging guidelines.