An hour drive might be enough to keep the starter battery on the edge with the sitting. I dont think charging your phone was the problem. I would put that battery on a charger just to be sure it got a full charge and then use that solar charger to make sure it does not start the slow drain again. But just in case you might want to pick up a voltmeter and keep an eye on the battery voltage, you may have a parasitic load somewhere. You can get a cheap meter at Harbor Freight for less than $10 if you dont already have one and they are invaluable in a motorhome for checking house batteries to fuses to lightbulbs. Your battery should sit at 12.6-12.7 volts when fully charged and 13.2 with that solar charger plugged in.
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