Hi @jamesmellors
Here's a video that shows how to replace the battery in the charge cover for the tablet.
There is a link under the video to a battery supplier. Alternatively look for the battery model number which is printed on the battery (too small for me to see clearly in the video) and then search online for the battery model number to find other suppliers that may suit you better.
Another good way to loosen the adhesive under the battery as opposed to what is shown in the video, is to apply Isopropyl Alcohol 99%+ (available from electronics parts stores) using a syringe, along the edge of the battery to soften the adhesive so that you can gently pry it loose a bit then apply some more gradually freeing the entire battery a bit at a time. Here's a video that shows what I mean. Start at 3:49 minutes into the video. You may have to apply more times as you keep lifting the battery as the battery in the charge cover is bigger. If you do this then ensure that the battery is disconnected from the circuit board first.
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