AccuCell Lithium-Ionen rechargeable battery suitable for BENQ-Siemens mobile phone: BENQ Siemens S81 compatible with Siemens rechargeable battery: BENQ Siemens S81Quality mobile phone battery incl. electrical safety device for preventing overcharge and overheating.This rechargeable battery has a short-circuit protection. It`s possible to charge this battery with your existing charger. Technical specifications (no original BENQ-Siemens S81 mobile phone rechargeable battery):System: Li-Ion rechargeable batteryVoltage: 3,7 VoltCapacity: 650mAhDimensions (LxBxH): 4,6mmWeight: 18Gramm