What does the yellow led indicate on the front of the batteries. There is a triangle with an exclamation mark inside it indicating a problem
. Batteries lost lots of power for no reason recently. We have no wifi so cannot send details. Thanks

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Thanks for this.We have managed to wrap up the batteries with insulation and we arrived to uncover them this morning Their temperature was 5 degrees and it had reached minus 5 degrees outside last night. All OK the yellow light has gone
Thanks