Genuine Lenovo 45N1040 UltraBay Battery 43 (3 Cell) This is a genuine secondary Lenovo 45N1040 UltraBay battery for the ThinkPad T400 Series, T500 Series, R400 Series, T410s Series, R500 Series, W500 series, T60 Series, Z60 and R60 Series, and the ThinkPad X6 UltraBases. On select models of ThinkPad laptops, you will find a slot opening near the CD bay. This bay slot is dedicated for a second battery & is a great feature not found on many laptops these days. This IBM 45N1040 Battery is compatible with ThinkPad T400 Series, T500 Series, R400 Series, T410s Series, R500 Series, W500 series, T60 Series, Z60 Series, select R60 Series models and is also compatible with the ThinkPad X6 UltraBases.
You will gain about 2 hours of additional battery life with this Lenovo 45N1040 UltraBay battery (in addition to your existing battery). We use the highest quality lithium-ion cells and components that charge faster and last longer than cheaper, lower quality batteries. Li-ion battery technology provides longer run times with less weight. In addition, Li-ion batteries are not subject to the memory effect common with older battery technology. This Lenovo 45N1040 Battery is 100% compatible with the original battery specifications and is individually tested and backed by a 1 year warranty. Tech Specs Xtend brand; 10.8 Volts; 2000 mAh or 32 Whr; 3 Cell Li-ion; Samsung (South Korea); Black; Assembled in China; 1 Year Warranty; 30 day full satisfaction guarantee; 300-500 recharge cycles; Combined with a 9 cell extended run main battery you can achieve 6-9 hours of run time depending on your power settings.
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IBM laptop battery part number: 57Y4536 0A36310 FRU P/N 45N1041 ASM P/N 45N1040