Opened but new and unused. Purchased in December 2024. I am selling it because I no longer need it. Product Description Manufacturer: VAIO Size/Specs: Product Model Number VJ8BPS52A Nominal Voltage: 7.7V Nominal Capacity: 5572mAh / 42.9Wh Size: 216mm × 80mm × 5mm Weight: 169g Compatible Models: VAIO S11 VJS112 S13 VJS132 SX12 VJS121 VJS122 VJS123 SX14 VJS141 VJS142 VJS143 Pro PK VJPK13 series VJPK13C12N Pro PK VJPK13 series VJPK13C12N Pro PJ VJPJ13 series VJPJ13C12N VJPJ22 series VJPJ224000001 VJPJ224000002 VJPJ224000003 VJPJ224000004 VJPJ224000005 VAIO Pro PG VJPG21 series VJPG214000006 VJPG214000002 VJPG214000003 VJPG214000004 VJPG214000005 VJPG13 series VJPG131AAL1B VJPG131ABL1B VJPG131GAL1B VJPG131GBL1B VJPG131JAL1B VJPJ131EAE5B Compatible Genuine Model Numbers: VJ8BPS52 VJ8BPS52A Note: Not compatible with the initial models of S11 (VJS111**) and S13 (VJS131**). This is the VJ8BPS52A, the successor model to the genuine replacement internal battery VJ8BPS52, which is installed in the VAIO S11, S13, SX12, SX14, Pro PK, PJ, and PG series. It is not compatible with models released after 2021.