I have apache RTR 200 4V which is 2.5 years old where i am having a ba

I have apache RTR 200 4V which is 2.5 years old where i am having a battery drain problem. 2 day ago i installed a new battery but still no impact it drains overnight afterwards i changed the rectifier thinking that the bike may have charging issue and still not solved. After some times automatically it starts indicating the battery sign on the digital metre and battry drains please do suggest me the solution??

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