Hello together, I have installed a 100 AH battery in the caravan. Age of the battery 2years. The previous one was defective. Got the wowa on Saturday from the dry winter storage and connected to the electricity. Today filled up water to flush through thereby determined that the water pump has little power. Also the blower of the heater is weak. Battery measured 13.7 A. With 220 V goes pump and blower as it should. After 2 hrs. battery measured 12.3 V. I suspect the original La I have a charger of CTEK similar to this one here https://www.ctek.com/en/battery charger 12v-24v/mxs-5-0-eu. I would also disconnect the original and connect the CETK. What do you think? If you want to get a battery charger from CTEK, you can get a battery charger from the charger.