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just had this problem - fridge only 1 year old, and Zig unit showed 2nd batt was fully chrged ????
checked the 2nd batt - found loose terminals and also low levels on the water in the cells - topped up, charged batt and sorted terminals and its working fine
 

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most 12v fridges have a voltage sensor built in so they dont drain the battery flat. they tend to cut the power around 11.5 volts.

i used to run one off a 110ah leisure battery and at best i got 3 days before the voltage dropped too low to run it.
 
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