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there are some control units still consuming(not sleep) even if the engine is off
check the alternative, battery properly charging,any accessories wire fixing properly
check the alternator and check the wires if their have a grounded... make sure that all of your accessories are turn to off specially the lighting system...
Check the alternator and check electrical accesories of the car maybe have partial leak...and check the connection of battery and battery termenal sometimes lo that is the problim may not charge...
Check the alternator and battery charger. there could be too much voltage entering the circuitry
bad charging
defective alternator diode
the dynamo needs to be checked and also the water of the battery
Dynamo Needs to be checked that it working 100% or may be any wiring issues from where the current is leaking.
most likely that it has a faulty allternator.
posible couse are the vehicle inside ligth is left on for long period while the engine is off.
There can be more complicated faults with CAN network, too. But there is missing another data about car (year, VIN number etc.).
