Hey guys , so I just made my first trip on a highway, and I absolutely enjoyed the speed and the thrill! But silly as I am, I made a rookie mistake of leaving the bike ignition on, and the battery went flat. I am currently searching for a new battery for my bike, but got quite confused about what battery I should buy ( I bought my bike second hand, have no user manual). Bike : Ninja 250 (2009) Should I use YTX9-BS or YTX7A-BS battery? an online store from ebay told me is should use YTX9-BS, which is mostly for 600cc bikes, and I just wanna listen to a couple more opinions from other riders. Can you guys help me out ? Thanks a million One thing I am sure of , I will never make the same mistake EVER AGAIN.