Nokia 5235 question. Help me!?

I had just bought a new Nokia 5235 and while I was working on it, it got struck and I had to remove the battery. I had removed the batter many times before but on those times, the phone was off. Now I had removed the battery while the phone was on. Will it damage my phone? I then noticed that the charge is going less nowadays while I am working on the internet and I had to often charge it? Is my battery damaged or my phone is damaged? Please help me.
 
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