Artisan Power Printek MT2, MT3-II, Mtp300 & FieldPro Printers: Replacement Battery. 2600 mAh Printek MT2, MT3-II, Mtp300, Mtp400 and FieldPro Replacement Battery. Fully replaces battery number 91304 and 91852. Lithium Ion Rechargeable Battery Pack | 7.4 Volt | Cells Made in Japan | 2600 mAh Longer Lasting: 2600 mAh capacity rating 18% higher than the OEM batteries. Manufactured by Artisan Power, a leader in premium quality replacement battery packs.