As the topic, now i find the cheap replacement batteries from this website
http://www.power-batteries.net, but replacement VS the OEM, which is the best?

http://www.notebook-batteries.org
We are a major distributor of notebook batteries replacement for compaq , hp ,dell , acer ,sony ,ibm ,toshiba..Our notebook batteries are made from high quality cell… (more)

http://www.espow.ca/laptop-batteries/sony-vgp-bps2.htm

How to account a battery life? the battery pack, so we don't know how many cells in the pack, we can see the Volt and Capacity from the label, some one say according to the Volt and Capacity can count… (more)