Originally Posted by BarracudaHockey

Here's the thing. If you have a big battery, its probably not going to sag. But A123 chemistry is so much better, I can fully charge in 10 or 12 minutes, so I fly 3 flights and charge, and put back between 40 and 50 percent of my capacity.

Also, you can charge them now and fly them at Christmas, they don't self discharge. I always charge while i'm packing the trailer, that way the batteries are ready to get next time I get to the field, whether its the next day or next month.