[http://www.ebay.com/itm/For-Microsoft-Surface-Pro-4-12-3-Tablet-OEM-Battery-Brand-New-5087mAh-/292096717768?epid=809608607&hash=item44025233c8:g:CvoAAOSw5UZY~1wMhttp://www.ebay.com/itm/For-Microsoft-Surface-Pro-4-12-3-Tablet-OEM-Battery-Brand-New-5087mAh-/292096717768?epid=809608607&hash=item44025233c8:g:CvoAAOSw5UZY~1wM|Here] is a link for the battery ($40).
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[http://www.ebay.com/itm/For-Microsoft-Surface-Pro-4-12-3-Tablet-OEM-Battery-Brand-New-5087mAh-/292096717768?epid=809608607&hash=item44025233c8:g:CvoAAOSw5UZY~1wMhttp://www.ebay.com/itm/For-Microsoft-Surface-Pro-4-12-3-Tablet-OEM-Battery-Brand-New-5087mAh-/292096717768?epid=809608607&hash=item44025233c8:g:CvoAAOSw5UZY~1wM|Here] is a link for the battery on ebay ($40).
Here is a guide for replacing the battery:
[guide|60358]
[http://www.ebay.com/itm/For-Microsoft-Surface-Pro-4-12-3-Tablet-OEM-Battery-Brand-New-5087mAh-/292096717768?epid=809608607&hash=item44025233c8:g:CvoAAOSw5UZY~1wMhttp://www.ebay.com/itm/For-Microsoft-Surface-Pro-4-12-3-Tablet-OEM-Battery-Brand-New-5087mAh-/292096717768?epid=809608607&hash=item44025233c8:g:CvoAAOSw5UZY~1wM|Here] is a link for the battery ($40).