The AC adapter (VGP-AC19V17) outputs 19.5V at 3.9A (approx. 75W). Replacement batteries are available from third-party sellers, but original Sony packs are rare.
Buy 2x2GB DDR2 PC2-5300 SO-DIMM modules. Note: DDR2 is expensive second-hand. Do not spend more than $15-20. sony vaio pcg-3j1m specs
The chassis design includes a standard array of legacy and multimedia ports: 1x HDMI and 1x VGA (D-Sub). USB: 3x USB 2.0 ports. The AC adapter (VGP-AC19V17) outputs 19