Second generation lithium-ion battery combines the latest in LiFeP04 cell technology and an onboard cell management system; Full function internal BMS (battery management system) provides individual cell voltage protection and cell balancing function. Allows quicker recharge with up to 10A current. Has LED readout showing voltage, % charged and battery temp in Celsius. Two (2) Year Warranty. MUST be charged ONLY with a lithium charger. See our Optimate offerings below. Fits ALL 2000+ Big Block Guzzis - ONLY available in the polarity shown. Check yours before ordering.