01-03-2012 06:55 AM
I tend to see the 40% figure--but I don't recall if that relates to the current battery technology in the Clip or earlier battery technology (I tend to aim at that level). batteryuniversity.com has good battery info.
01-03-2012 07:06 AM
For lithium batteries such as in the Clips, batteryuniversity.com says that random charging is fine--for storage, it recommends a 40% charge. It also states that partial charging is preferred, and that full discharges should be avoided.