[Q] Battery problem? - Galaxy Tab 3 Q&A, Help & Troubleshooting

Hi to all,
Three months ago I bought a Galaxy Tab 3 10.1 (GT-P5210). At first it went well, but after a month more or less, battery started doing weird things. It doesn't last too much, about two days with only 45min of screen and if I shut down the device for example with a 60% of battery, when I turn on again after some hours, the percentage decrease to a 50% or less. Is it normal or my battery is faulty?
Would it be ok if I change the battery? or is this normal?
Thank you and regards.

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