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You will need the old key. If you have it tape it to the new barrel each key has a chip to tell imobeliser its correct the old key taped on the barrel is the only way
Try using the old key and place it near the barrel then turn the new key. These keys have RFID that the immoblizer can detect. Once key is changed, it will still look for original key to disable immo.
Check the silly stuff first. Are you leaving the lights on or something plugged into the cigarette lighter. You'll be amazed how fast a SatNav can drain a battery. How old is the battery? Some batteries can only last about 5 years especially if the vehicle is used every day. Check the condition of the battery and the alternator. Get a good garage to test the battery 'under load'. This is where they test the voltage with the engine running. This will tell you if it is a worn out battery or an issue with the alternator.
If they are OK you could have a wiring short somewhere that is draining the battery.
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