Battery Energy+ brand Li-Ion 6 cell for Acer Aspire 2420, 2920, 3620, 3640, 3670, 5540, 5560, 5590 series Acer Extensa 3100, 4120, 4220, 4420, 4620, 4720 series Acer TravelMate 2420, 2440, 2470, 3240, 3250, 3280, 3290, 3300, 4320, 4520, 4720, 6231, 6291, 6292, 6492 series replaces BTP-APJ1, BTP-AQJ1, BTP-ARJ1, BTP-B2J1, LC.BTP01.010, LC.BTP01.011 "11.1V 4800mAH Fully Charged and Tested 1 year Warranty"