Something is draining the battery, or either the alternator isn't putting out to keep the battery charged. A local shop can usually check it for free and let you know if it's the alternator. The other is a shortage somewhere which will be a pain to trace down.
If your vehicle is a 1.6 then it is possible cam sensor has failed and it will drain your battery
Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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