Tracyliu88's Fotothing

1. Remove the VGP BPS13/Q laptop battery - making sure that it is charged to 40% and store it in a dry, warm place. Ensure that it is wrapped protectively and nothing will be dropped on it.
2. Do not forget to take away your Sony VGP-BPS13/Q laptop Battery Pack from the device if you will not use it for a long time, if not, it will keep the battery in a constant state of charging up and that will reduce the life cycle of the Sony laptop batteries.
http://www.battery-sale.co.uk/sony-vgp-bps13-q.htm