Sony PCGA-BP51 replacement laptop battery by Amstron is made from the highest quality cells and parts. The LSO-10 is designed to meet or exceed original equipment specifications. This battery has been rigorously tested to ensure that it is 100% compatible with the Sony Vaio PCG-505, PCG-C1, PCG-N505 and other series of Sony notebooks • Chemistry: Li-Ion • Rating: 11.1V 1800mAh • 20% Longer Lasting than original Sony PCGA-BP51 Battery. • This item is NOT compatible with the PCGA-BP11 • Warranty: 1 Year