Disconnected battery

Had my battery off the car now for over 6 weeks, just wanted to know if I'm likely to have any issues with the ECU or keys when I connect it back up? It's a 1999 facelift 1.0l with the red chip in the key (no buttons on it)

It was broken for a while and I remember I kept taking it off and charging it when I drained it on start-up attempts but I can't remember the longest it was off the car in one go
 
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