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I have samsung tab 4 10.1". Battery takes longer to charge and very quick reaches back to 0%. Does it mean that battery needs a replacement???

Sid, It does sound like the battery is on it’s way out, if after charging 12 hours and looses charge a lot quicker then in the past, replace battery. Check IFXIT Parts and Tool store for replacement battery. I hope this helped you out, if so let me know by pressing the helpful button.