i need to replace the battery in my kindle keyboard ("3rd generation") so I can use it again, or surrender and order a replacement. I'm using a kobo right now b

i need to replace the battery in my kindle keyboard ("3rd generation") so I can use it again, or surrender and order a replacement. I'm using a kobo right now but I don't like it. I was looking at the oasis but its expensive, and still uses microusb