ProMariner - ProSport HD Waterproof Marine Battery Charger Gen 4 - 6 Amp - 1 Bank - 44006. ProSportHD Generation 4 boasts a tri-surface heatsink design. This heavy-duty lightweight design delivers significantly faster charging through optimal cooling, while delivering true rated amp output during charge mode.. ProSportHD's enhanced microprocessor and software provides digital features including: fuel gauge style Charge Completion Monitor, Charge Mode, individual Fault indicators and three digita