lipo battery

[ginge]

Hi I am thinking of buying two 3200amh 2cell 20c lipo batterys
They are the hard case stick packs

Will they be ok to race a 10.5t brushless motor
I will be racing 4 races and then a final in a day
The races are around 5min long. Will they last that ??
Their is about a hour between each race. Will I have them charged in that time. ??

Also
I thinking of using the stick pack because I am racing a old chassis but it can be cut to fit the square packs. Would I be better with the square packs ??

Thanks