If it was only left for 6 days then it was probably not drained to zero. Did you measure the voltage that was on it?

When you charged it did you note how many hours it took to charge it at how many amps? For example when I have had a battery that is "end of life" it will take a charge of 4 amps (from my charger) but only for a half hour or so. That is a bad sign. On the other hand if it takes 4 amps for 10 hours or more and then finally tapers off then it is probably fine. Bigger chargers will charge at a higher rate and smaller at a lower rate but this gives you an idea. I have a "regular" battery charger that I think says it can do 6 amps.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra