About 100,000 battery packs used in ThinkPad notebook computers are being recalled because they can pose a fire hazard if the battery is struck forcefully on the corner, such as from a direct fall to the ground, the U.S. Consumer Product Safety Commission said Thursday.

The commission said Lenovo Inc. is recalling about 100,000 lithium-ion extended-life batteries after it received four reports of batteries overheating and damaging the notebook, causing minor property damage and in one case, minor eye irritation.

There is not an internal battery cell defect, however, the CPSC said.

Lenovo sold the batteries with new ThinkPad notebook PCs or as optional or replacement batteries for the following ThinkPad models: R Series (R60 and R60e), T Series (T60 and T60p) and Z Series (Z60m, Z61e, Z61m, and Z61p). The recalled 9-cell batteries have the part number FRU P/N 92P1131, which can be found on the battery label.

Customers should stop using the recalled batteries and contact Lenovo to receive a free replacement battery. Lenovo can be reached at (800) 426-7378 or http://www.lenovo.com/batteryprogram.