The hp elite x2 1012 g1 tablet pc utilizes the mg04xl battery, a 4-cell lithium-polymer unit designed for optimal performance and longevity. 
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mg04xl battery – key specifications
• battery type: lithium-polymer (li-polymer)
• voltage: 7.7v
• capacity: 40wh (approximately 5100–5195mah)
• number of cells: 4
• form factor: internal (non-removable)
• weight: approximately 262.8g
• compatible part numbers: mg04xl, 812060-2b1, 812060-2c1, 812205-001, hstnn-db7f, hstnn-i72c    
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compatibility
the mg04xl battery is specifically designed for the hp elite x2 1012 g1 series, including various configurations such as v2d62pa and v2d16pa.