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A battery with diminished capacity can show up as fully charged but have no useful reserve capacity which seems to be the symptom you're describing with the battery voltage dropping to nothing when a load is applied. It simply can no longer supply sufficent power to maintain the voltage.
Was this a gel or AGM battery? I've been kind of curious about the life expectancy of these.
Also, get yourself a 'smart' battery charger with a 2-amp charge limit setting. You should only charge a battery at a maximum 10% of the amp-hour capacity but an occasional 2-amp charge won't hurt them.
Trickle chargers are fine for maintaining a battery once charged but most aren't designed to charge a battery that's seriously depleted.
Jim
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