BAD... Dead Optima Battery

[Tomkreiner]

So, after 6 weeks away on business, etc., I returned to a VERY dead Optima battery in my '02 Boxster.

So dead, that when I connect any power source to the emergency power connector in the fuse block, the horn sounds constantly. After some five minutes, however, it quiets down significantly.

Things I tried: 14 V jump box - fully charged, jumper cables, battery charger, hi amps, low amps, 75 A boost, turning key to unlock, and lock / unlock, turning ignition on. Removing fuses, etc.

After the horn quieted, I left my 2 A battery charger on it for three hours... To no avail. What do I do, any ideas? Without taking a wrecking bar to the hood, I have no idea as to how I can open it to service the battery.

Please let me know what I should do next. --- before having car towed to Dealer$hip.

Thanks in advance...