should i be concerned about getting problem in the future with the hybrid system(battery)?
I have owned Jazz Hybrids for 9 years now, my first one a 2011 HS went to 256,000 miles (2011-18) and the engine and hybrid battery were still good after all those miles. My current Hybrid is a 2015 HS-T and has 134,000 miles on it, and again no issues.
How long is the battery life?
Who knows but I haven't known of any hybrid battery issues.
Can i disable the hybrid system, make it a non hybrid car?
No.