There really isn't any memory in them. There is value to slow charging, but even more important is temperature and avoiding keeping them near full charge for an extended period of time.
There isn't any "memory" in a lithium polymer battery's chemistry like was found in NiCd and early NiMh batteries, but on some devices, a full charge/discharge cycle functions to program a true digital memory in the battery management controller about the actual properties of the battery.
From the same source: http://batteryuniversity.com/learn/article/battery_calibrati...