Lap topbattery for Nokia N81 1,Security; 2,High capacity: 1,100mAh; 3,Average voltage: 3.7V; 4,Maximum voltage: 4.2V; 5,Lithium ion mobile phone battery; 6:Suitable for mobile phone: Nokia N81/N82/E51/E51i/6720C/BP-6MT; 7:carried standers:GB/T18287-2000; 8:matters need attention: rechargeable li-ion battery use specified KCM&NOKIA charger only ; 9:Must be disposed of properly;May explode if damaged or disposed infire ;