IBM Lithium-Ion Primary Battery for Thinkpad T20 Series 2647 (02K6649)

Are you a ThinkPad T Series customer who needs an extra Lithium Ion System battery? For extended power needs, you may want to have an extra system battery. The ThinkPad T Series Lithium Ion System Battery is a rechargeable battery that supports the ThinkPad T Series. This battery contains 8 cells providing an output of 10.8V and can be recharged in 2 to 5 hours depending on the ThinkPad system usage. Spare system batteries can be swapped in to maximize unplugged system usage.The battery operates and recharges in the battery slot of the ThinkPad - it can be swapped out with the standard system battery to extend the unplugged usage time of the ThinkPad. (Amazon)