read this A Guide to Understanding LiPo Batteries.If you are in no hurry, is the the factory good enough for charging?
Also, I made my first flight today, and landed once when the battery was still good, and the second flight after first warning. Can they be stored now until next week as is or do I need to charge them some? I don't have a volt meter and am going to get a better charger if necessary that charges two at a time. Batteries were barely warm when I landed.