phone charges and discharges very fast .. sometime reboots suddenly at around 40% battery

I own a htc 816 g .. my phone from the past week is showing dis problem . It charges within 40 minutes or so . Then it discharges very very fast . Battery is like 80% to 60% within seconds . I dont have any extra apps . Sommetimes it switches off when battery is. Around 35-40% . Plzz help and tell whats the matter

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