this 40 amp charger would be appropriate for a battery with a maximum AH capacity in the 400AH-600AH range
Terminal Type: 3
5399100145 (80A w/Boost)
Moving Magnet construction
Insulation Resistance: DC 500V 100MΩ or more
696600 - Power Forged 100 Amp Heavy-Duty Rectifier, Positive Base Direct Replacement for Associated Eqpt 610100, 610122 Part Type_Rectifier this 40 amp charger wouldOur Heaviest Duty Positive Base Rectifier. Designed for use in chargers with continuous duty output ratings up to 100 Amps, and "Boost" ratings up to 600 Amps. This rectifier is a direct replacement for Associated P N 610100, used in Associated charger models 6001, 6002, 6002A, 6002B, 6003, 6006, 6008, 6009, 6009A, 6014, 6027B, 6065, NAPA 85 800, MATCO MC600, and SNAP ON models YA165A, YA166B, YA167A, YA167B, YA168A, YA268, and others. Excellent