Your battery is most likely at the end of its life.
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To be certain, use a battery utility, such as [http://www.coconut-flavour.com/coconutbattery/|coconutBattery] (for Mac) or [http://www.3u.com/|3uTools] (for Windows). Anything less than 70% of design capacity will require replacement. However, because your device is not booting, you’ll want to test to see if the charging circuit is drawing current or not.
If you have access to a [https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=USB+Ammeter|USB Ammeter], you could use that to determine if the device is really drawing current when it says it's charging.
Your battery is most likely at the end of its life.
To be certain, use a battery utility, such as [http://www.coconut-flavour.com/coconutbattery/|coconutBattery] (for Mac) or [http://www.3u.com/|3uTools] (for Windows). Anything less than 70% of design capacity will require replacement. However, because your device is not booting, you’ll want to test to see if the charging circuit is drawing current or not.
If you have access to a [https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=USB+Ammeter|USB Ammeter], you could use that to determine if the device is really drawing current when it says it's charging.