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Welcome to the Bunnings Workshop community @greg1934. It's sensational to have you join us, and many thanks for your question about AEG line trimmers.
Could you tell us which model AEG line trimmer you have? In the current range, the AEG 18V 33cm 4.0Ah Brushless Line Trimmer Force Kit makes reference to its compatibility with a 6AH battery in the description. "It is well balanced with a great performance from the top-mounted motor, delivering over 25 mins of run-time on the HIGH setting under a good-size load (with 6.0Ah Battery)."
That leads me to believe it is compatible, but let us know if you run into issues or have a different model so I can check compatibility.
Please let me know if you have any questions.
Mitchell
