[helijeli]

My 2 cents as well. I also agree with the last few posts. Until recently I always charged my batteries as soon as I got home from the field so that they are always ready, plus with only one charger at the time it would take all afternoon to charge them all. Since reading about Lipos, I also agree that Lipos should be stored at 3.8V (40% charge), If you store Lipos fully charged they lose around 40% capacity per year. I've gotten pretty good at timing my flights to finish at this voltage. You can discharge to 20% safely (around 3.75V) for more duration but you risk damage if you go any further than this - especially if you do it repeatedly. The Turnigy Balance Chargers will balance storage charge to 3.8V per cell and at least it's partly charged for when you want to fully charge before flying. If you want to be really fussy, it's also best to store Lipos at just above freezing, in the fridge is ideal, although the missus might have something to say about it.
The problem I found was that when it came to Friday night, you would be pushed for time to charge all your batteries, especially if you have a dozen or more. Since Whitedg's generous Power Supply donations, I've invested in a Turnigy 4 Port charger, so now I can charge 5 batteries at a time (with my original single charger as well) all running off the 87A Pwr Supply - and it still only draws well under half it output capacity. I can charge heaps of Lipos in a couple of hours ready for the next day. That many batteries charging at once does make you think a bit more about safety as well - lots of energy and wires everywhere!