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True on the car battery rarely charging at 75A, that's also the way the system the OP described would be working. The juice would only be passing through the battery to the modem, and hopefully the smart charger would down-regulate/shut off when not needed. I have looked into the regulator...

Back from the dead to question something several people have said - why would applying continuous charge, especially of only .5a to a 12v lead acid battery damage it? Anytime a person drives a car their alternator is continuously charging the battery to the tune of 75a, which absorbs any spikes...