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Answer to "Why does car battery and caravan battery go flat"All that is required is a cheap digital Meter. Measure the voltage when you stop, and before you connect to mains. Couple of hours later check voltage on both batteries, it should be at least 13 volts if charging system is working, anything less would point to a charger malfunction. As a quick solution connect a mains battery charger which should overcome innitial problem and get your system stable.