NOW COMING TOWARDS THE PROBLEMS THAT I FACED
The biggest problem till now I faced in the failure of battery twice. I was using 9A lead acid battery. we did some juggarh to fit the big 9A battery in place of a tiny 4A battery which comes in stock CG deluxe. After 15 days of the swap, the self starter of bike did not work. i checked the battery then it was full dry and having not a single drop of water. but tb tk buht dair ho chuki thi, battery ka cell damage hochuka tha. the battery was in warranty so I went to the dealer to claim the warranty which he readily replaced with a new one. I installed the new battery without diagnosing the root cause of the battery damage.
and after 20 days, that battery went dead too 
I was like Bhainss ki dum Teeka lg gya aik aur. because the dealer said that it cant be claimed twice. 
Khair, I started brain storming. the main symptom was drainage of battery electrolyte which is a clear signage of over charging of rectifier. So I went to the electrician from whom I got my wiring done. He cut one or two wires of rectifier and said ab ye theek charge krega. So I got a new battery of 9A worth 1500 PKR again. After a week on installing a new battery, i went on my annual tour to Deosai with @vickytulla @angel82 @NOM1 @RocketScience.
When I reached Rama, the battery of the bike got dead again. I can imagine my condition while hitting kicks of the bike for rest of 7 days of the tour. But I filled some water in the battery and battery got live again. So tour went well Alhamdulillah, about the tour, Waqar bhai has aleady made a thread so you can get details from there.
Khair tour se wapas aa kr, I consulted with Waqar bhai who gave me Ravi Piaggio's rectifier and I got that rectifier fit from his electrician. its been 3 weeks already and Now the battery electrolyte level is not going down and bike start with self like a charm 