Hello all
well i'm making a completely scratch built cessna 182 from dblums plans
i scaled downed the plan to 30% because i want a smaller model (though i regret it now )
i fit the following motor and esc in the model
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8140
and
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=11429
the overall weight of model with motor and esc is around 70-80gm
now i want to go for 3s power system but confused which battery should i use
the battery compartment in model is 75mmx40mm(strictly)
plz help me 

here are few pics of my incomplete model

you can go for these two batteries.
http://www.hobbyking.com/hobbyking/store/__9173__Turnigy_800mAh_3S_20C_Lipo_Pack.html

http://www.hobbyking.com/hobbyking/store/__9163__Turnigy_1000mAh_3S_20C_Lipo_Pack.html

thanks but i'm looking for nanotech batteries

Check this batteries

http://www.rcdhamaka.com/index.php?main_page=product_info&cPath=102_94&products_id=788

they are out of stock but you can speak to store about new stock.

these are better or equal to nano-tech batteries.

http://www.hobbyking.com/hobbyking/store/__18203__Turnigy_nano_tech_850mAh_3S_45_90C_Lipo_Pack.html
http://www.hobbyking.com/hobbyking/store/__21332__ZIPPY_Compact_850mAh_3S_25C_Lipo_Pack.html
http://www.hobbyking.com/hobbyking/store/__20389__Turnigy_nano_tech_950mah_3S_25_50C_Lipo_Pack.html
http://www.hobbyking.com/hobbyking/store/__18205__Turnigy_nano_tech_1000mAh_3S_45_90C_Lipo_Pack.html

I think you should go for the nano 950 or 1000
use a buddy code

Well rcnitesh i was also thinking about same
Thanks for your reply buddy

It seems your model is way too overpowered for its small size. Try going for a lighter motor with a lower thrust. Your model is as it is much smaller than the actual plans. And also try using a 2S setup for the same.

Regards

Overpowered 
All these days i was thinking that it is underpowered 
Are you sure
My plane's lenght is 30 cms. While its wingspan is 48 cms.

The full scale one was designed to be used with a CD-Rom Motor. So you should scale down accordingly.

Yeh i saw that but it was rewound accordingly
I myself made one. It was quiet powerful though

Can you tell me what will happen with overpowered setup ??

Low flight times. I don't think the structure is designed for such loads etc.

Thank you for your replies sir
Next time i will ask you before choosing a motor !!
Regards