I had the same issue with the Amazon battery, cleary this was used. Disputed with Amazon, and they replied with the fact they tested batteries before they shipped. I asked why they would test brand new batteries. After which, they refunded my money and told me to keep the battery.
I found another source for OEM Samsung batteries, and it appears to be a brand new battery. I've been using it for 35 minutes, and it's still 100% charged. This reminds me of when the tablet was brand new. Not allowed to submit a link, so search forI had the same issue with the Amazon battery, cleary this was used. Disputed with Amazon, and they replied with the fact they tested batteries before they shipped. I asked why they would test brand new batteries. After which, they refunded my money and told me to keep the battery.
I found another source for OEM Samsung batteries, and it appears to be a brand new battery. the screw holes are in pristine condition no markings from a previous installation. That was the telltale fine at the Amazon battery was in fact you used.
I've been using it for 35 minutes, and it's still 100% charged. This reminds me of when the tablet was brand new. Not allowed to submit a link, so search for GH43-03780A as a part number on encompassparts dot com.