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here. with increases in technology and materials, batteries have increased in performance, energy and cost. need battery warranty information? call us today with the battery part number you're needing. *** ALWAYS CHECK PIN POSITIONS ****************************************** NOT TO BE USED IN SATELLITE *****M40-S312TD,M45-S165,M45-S1651,M45-S165XM45-S169,M45-S1691,45-S165X,M50(PSM53E)M50-180,M50-227,M50-228,M55-S139,M55-S139X****************************************