The Sony PCGA-BP2T replacement laptop battery by Amstron is made from the highest quality cells and parts. The LSO-27 has been rigorously tested to ensure that it is 100% compatible with the Sony PCG-TR1, PCG-TR2, PCG-TR3 and other series of Sony notebooks. Take your work on the road with you without sacrificing performance and productivity with Amstron brand Sony laptop batteries.. • Chemistry: Li-Ion • Rating: 11.1V 4400mAh • Will meet or exceed original specifications • Warranty: 1 Year