You can build one your self stacking a few led power supplies by mean well. Basically you hook the outputs in serial and the inputs in parallel. You adjust them for a certain voltage depending on your pack and drivers side door jam sticker. Is yours 144 volts? I cant remember which, but one year of HCH they added some extra cells making it 156 volts or so.
Ultra Cheap Grid Charger - Insight Central: Honda Insight Forum