I have bought a plane which needs 7.4V 1100mAh 15C Battery and it is not available on any Indian store. But in few stores I have seen 7.4V 1800mAh 20C is available. Is it use? or will I face any problems in future?
Thanks.
You wont , just check the COG with the new battery.
You can go safely with Haiyin 7.4V 1000mAh 20C:
http://www.kinetichobbies.com/haiyin-2-cell-7-4v-1000mah-20c-lipo.html
1800 mah is just fine no worries at all . u will get a bit more flight time anyways as said by @rcjabalput u need to check the Centre Of Gravity and adjust it ..... on a personal not- I dont think it will affect the CG much still do a cg test and check it ...
Thanks all for the help, finally I got 7.4V 1800mAh 20C from RC Dhamaka , I am gonna move a step forward :)