RE: need advice, before BOOM!!
Yep Lipos have a very very low self discharge rate compared to regular cells like Nihm and Nicads.
You can go an easy couple of days after charging them, and still use em, they'll still be close to what they were when you took em off the charger.
If they are going to be sitting for say a week or more, it's best to drop em to storage value.
If you are 3.3 volts or better per cell you are golden!!!