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No! Never use a load tester on the charger - you'll blow them both!
But, I still suspect the battery. Even if only a year old, there are lots of reasons a battery can fail prematurely. Manufacturing defect, hitting a pothole and breaking/cracking the plates, alternator output too high and so on.
Have the battery load tested. Test the battery with a multimeter when it's not hooked up s/b no more than 13.2volts. Hook battery back up and run car, this time when you connect the DMM leads to the battery terminals, you should see 13.8-14.2 volts, if more, the alternator diodes have probably failed and this is cooking your battery.
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