This is the size of the "option parts" battery from the gaui manual.

[Crash549]

http://flying-hobby.com/catalog/product_info.php?cPath=1_2&products_id=1503 I am tempted to buy a couple. My kit came with two of the 2200mah packs and so far they have run cooler than my 25c 2100mah Thunder power pro lite packs. I bet these 3300's would last hmmm 30% longer flights? What 3300 pack does everyone like to fly? I know this has been asked many many times and I don't think this will be the last.

[Pinecone]

I am flying a pair of Flight Power 3200 packs and a pair of Hextronics 3200 packs.

The HXTs are a bit wide for the lower pack to slide into the frame without using a small amount of force, but they work well and the price is right.

www.hobbycity.com

And order someting small and cheap, that will get you member pricing. Then log in and check the packs prices. Some packs drop $30 in price as a "member".