Please need help urgent

I'm running ultimate ROM v6 for last 4 months 10 days back I purchased original Samsung battery from store with warranty but today morning I charged my phone till 20% and put phone on auto brightness but I didn't used it but after one hour when I turn it on it was rebooting itself then I got in recovery and wiped dalvik cache and cache and turned phone on again but this time phone battery was 0% and screen flickers and turned off phone I need help plzzzz
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