Premium quality replacement ThinkPad R40e IBM laptop battery. This 10.8volt, lithium-ion (Li-ion) IBM laptop battery from battery-supplierser is rated at 4400mAH capacity and is 100% compatible with the original equipment.

IBM ThinkPad R40e Series batteries features:

•Uses the highest quality graded and sorted cells. 
•Provides excellent discharge characteristics.
•Utilizes state of the art printed circuit board (PCB) design to provide stable and safe performance.
•Undergone comprehensive quality testing throughout the manufacturing and assembly process.
•Includes a 12-month free replacement warranty for manufacturer's defects.

Compatible Part Number:
08K8218, 92P0987, 92P0988, 92P0989, 92P0990, 08K8218, FX00364

Fit Models:

IBM ThinkPad R40e Series
ibm ThinkPad R40e 2684, ThinkPad R40e 2685

Specification:
Battery Type: Li-ion,  Volts: 10.8V,  Capacity: 4400mAh

IBM Thinkpad R40E battery notice:

Follow the notice below, prolong your Thinkpad R40E laptop battery life

1.Exercise Your Battery - Do not leave your Thinkpad R40E battery dormant for long periods of time. We recommend using the battery at least once every two to three weeks. If a battery has not been used for a long period of time, perform the new battery break in procedure described above.
2.Calibrate Your IBM Thinkpad R40E batteries - If your Thinkpad R40E battery's 76% even less in work , you must fully charge, fully discharge, and then fully recharge the laptop battery pack.
3.If the Thinkpad R40E battery will not be in use for a month or longer, it is recommended that it be removed from the device and stored in a cool, dry, clean place. The IBM latpop batteries will self-discharge during storage; remember stored at about 40% state-of-charge
4.Charge and discharge - For lithium ion batteries, you do not need to discharge them fully and recharge constantly. You need to do a full discharge only about every 30 charges. Do not charged to higher voltages than its threshold voltage.
5.To get maximum performance from your Thinkpad R40E battery: Only run what you need. Keeping programs running in the background will require more system resources, and use more of the precious battery juice.
6.Consider removing the Thinkpad R40E battery from a laptop when running on fixed power.
7.Carefully maintain your battery : keep your Thinkpad R40E battery in dry clean and cool place. Wet and dirty can erode your laptop battery. Keep battery away from fire or other sources of extreme heat. Do not incinerate. Exposure of battery to extreme heat may result in an explosion.
8.More battery maintain infomation in laptop battery blog