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I had a recovery van out and they checked the alternator was charging but the battery was not topping up or keeping a charge.
The mechanic said he changes his battery for a fresh one every year.
He is also.doing a ride with Charlie Boorman to Capetown next year. He interestingly said he (the mechanic)isn't doing it on the BMW gs as the one bike he has to pick up all the time is the new model GS and it is always an an electrical fault, often due to one of the sensors
It's worth checking the system is charging properly.