charger question

Mr.lst,

Your 2S3P pack will be "seen" by the charger as a 2S (2 cell) pack, so you're good to go in that issue.

As for the flightpower packs, you really need to watch it when going for capacity over 4900mAh. Even the 5000mAh packs (IIRC) are too big/long for the run of the mill car/truck applications. That's why the 4900mAh packs are so popular. If you NEED the capacity, you may be able to run either two of the 4900s or smaller packs in parallel to get the capacity you want. If you are lucky, you'll have the room for the larger packs.

I believe that PolyRC, Hyperion, and Polyquest have packs up to 5000mAh and they are supposed to be made of the same cells used in flightpower packs. I believe that they are Enerland cells.