Thanks NMPhi767. More duration would be nice but I made the mistake of bringing my wife with me when I was buying my first equipment for my Slow Stick. She vetoed the li-po batteries and charger because of the cost.

So putting a 8.4v battery in when it recommends a 7.4v is not a problem?

Duration won't be that much of a problem though. I fly in a baseball diamond that is across the street from me. I can be flying within 2 min of walking out the door. Besides longer flight times attract more kids (i mean walking obsticles).