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Item: IM1KM1617 Model: 43R2499-BTI
Replace a failing battery or take along a spare with this BTI 7800 mAh replacement li-ion battery, which is compatible with Lenovo ThinkPad R61i, R61, T61, T400, and R400 notebook computers. This nine-cell lithium-ion battery is rechargeable, and its 10.8 VDC output voltage ensures it will power your laptop with ease. It comes with an 18-month limited warranty, so you can replace it if it fails during that time.