these are the lipo i have:

https://www.amazon.com/Turnigy-Nano-tech-1800mah-65~130C-Lipo/dp/B00TDB3XAQ/ref=as_sl_pc_tf_til?tag=napto-20&linkCode=w00&linkId=2770d5e2ddc3a36ec1475cca81c74a7c&creativeASIN=B00TDB3XAQ

both 3s and 2s..I've got some 11.1 but I'm not looking to increase power/FPS just get some longevity and rechargeables in there so I don't have to purchase C batteries all the time...

I'll givethe 15a a look and see..maybe place an order on foamblast and get the 15a to hold me over and if they break at least I've got some on order :P