Microsoft Surface 4 and Surface Pro 4 Battery Replacements
Amazon.com: OUWEE DYNR01 Tablet Battery Compatible with Microsoft Surface Pro 4 1724 12.3 inch Series Notebook G3HTA027H 7.5V 38.2Wh 5087mAh Tools : Electronics
Surface Pro 4 won't charge or turn on...because it caught fire!! - Microsoft Community