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How about a little more information.
What does your charging system put out now? Is it above or below 13.8 volts? Run the lights for 5 minutes then have someone start the car and run it up to 2500-3000 rpm. After it starts put a voltmeter across the battery. Monitor the voltage for a few minutes. IF it reads 13.8-15.2 volts I would say your charging system is good and you need to look elsewhere.
You said your car was parked for a month. I would wonder what is pulling the juice out of your battery and killing it. Aftermarket stereo & amp? Glovebok light not turning off? Other accessories installed? I have left my 97 855R sitting for weeks while on vacation and it started just fine.
If everything else checks out OK my final suggestion is to buy either a trickle charger or a quick disconnect switch for the battery and disconnect it next time before you leave the car sitting for a month.
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Nathan Valles, Black 855R, Tint
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