Check the listing for details. Optimate Pro-4 Duo. Condition: New. Listed at 622.46 USD. OptiMate PRO-4 DUO, the 4-channel professional combination battery charger-tester & power supply for powersport, small marine and light aircraft repair shops and battery retailers. Suitable for new or used 12V lead-acid batteries from 3-50Ah and 12.8V /13.2V LiFePO4 batteries from 2-20Ah. Four fully independent 5 Amp charging outlets each with 3 Selectable modes to service NEW and USED powersport batteries, including 12V lead-acid, AGM, GEL and 12.8V lithium (LiFePO4 / LFP). • 60': A shortened program with charge time limited to 60 minutes or 1 hour with auto detection of battery type. (If no selection (Pb or LFP) is made prior to connecting a battery the 60' mode becomes the default selection) • Advanced testing: quick identification of bad batteries and automatic retesting of a good bat.