This Sony VGP-BPS13/S battery maked with Hi-Quality battery cells, which is guaranteed to meet OEM specifications. All Sony VGP-BPS13/S laptop batteries on sale have passed the strict quality control tests that ensure they will work well. We offer 30-day money-back refund on every Sony VGP-BPS13/S battery we sell.
http://www.newbattery.ca/sony-vgp-bps13_s.html