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From what ive seen, and heard (this happend to me) a battery fault is where your line is making contact with another line often caused where water is acting as a conductor
Edit: You should probably report this to 151 as a line problem and get this sorted out if you havent done already 🙂
The negative and positive wires of your cable pair are known as the battery wire and earth wire. If either of your wires are in contact (touching) the negative wire of another customer's pair it is referred to as a 'battery contact'.
Does that mean they have fixed the battery fault? Or crosstalk ?
try a quiet line test, if its a battery fault then there would have been noise on the line