IBM (08K8190) Battery for ThinkPad T40

ThinkPad T40 Series customers with extended unplugged power needs will want to consider keeping an extra battery in the Ultrabay Slim device bay. The ThinkPad Ultrabay Slim Li-Polymer Battery is a rechargeable battery, which can be used in the Ultrabay Slim of the ThinkPad T40 Series. Adding this battery to your system extends your unplugged usage time. For maximum unplugged operating time, customers will want both the ThinkPad T40 Series High-Capacity Li-Ion Battery and the ThinkPad Ultrabay Slim Li-Polymer Battery. This battery has an output of 10.8V and can be recharged in 2.8 to 4.0(1) hours, depending on the ThinkPad system usage. Minimize