Here you can compare the prices for rechargeable batteries IBM, get acquainted with photos and technical characteristics (for example VIP points, Battery LED indicator, Balance connector, Capacity, Warranty, Box width (imperial)) and buy a liked model rechargeable batteries in one of the reliable online stores.
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TP T40Ser HighCap LiIon Batt
Up to 1/3 more capacity than the standard system battery. This high capacity battery has an extended area on the back edge and fits in the standard ThinkPad T40/R50 system battery slot. Its compatible design allows it to be in the system when the system is connected to Dock II, Mini-Dock, and Port Replicator II and it can be recharged with the new, optional, external ThinkPad Multiple Battery Charger II. All-day computing is a reality (up to 8 hours on select systems)* when you combine the ThinkPad T40/R50 Series High Capacity Li-Ion Battery with the optional ThinkPad Ultrabay Slim Li Polymer Battery. *These model numbers achieved eTesting Labs, Inc's BatteryMark 4.0.1 Battery Rundown Time of at least the time shown. This test was performed without independent verification by eTesting Labs, Inc; eTesting Labs, Inc. makes no representations or warranties as to these test results. BatteryMark is a trademark of Ziff Davis Publishing Holdings Inc., an affiliate of eTesting Labs Inc., in the U.S. and other countries. A description of the environment under which the test was performed is available at http://www.ibm.com/pc/ww/thinkpad/batterylife. Battery life (and recharge times) will vary based on many factors including screen brightness, applications, features, power management, battery conditioning and other customer preferences.