Why is battery life draining off too fast ! samsung galaxy s4

Hi,

Good Day

I have samsung galaxy s4 I9500.

what could be the reason that battery charge very fast and discharge also very fast.

Almost charging and discharging time reduced to 50-60%.

often, at 30-40% remaining battery my phone get power off and never turned on till recharging start. some time it start recharging it from 20-25% (phone was unable to power on until plugged into charging at this stage) and complete charge till 100% in 30-40 minutes.

Please suggest the way forward to handle this situation? is it a battery problem or a phone problem?

Regards,
-X

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