Evoque ; battery problems , engine does not start…….

Hello, I hope someone here has an idea that workshops can not get there. Have one : Evoque Prestige 2 Automatic Diesel 4×4 110kw Bj 2014 Some equipment (Stand Heating, Keyless, Surround Cameras,Drive/Safety Assistants, Tyre Pressure…..) One year after purchase went off; Stand Heating never starts , Automatic tailgate and seat adjustment spins sometimes. Shortly afterwards; Before engine start always the message: engine start, system runs down in 1min. After 2 years; engine leaves but it didn’t shut down all the systems as it should to guarantee a motor start, everything went (keyless system,radio,ventilation,light…..) except auxiliary heating. Was very often in the workshop, battery was charged several times but 1.5 days later again problems, various updates…. A year ago then battery changed = everything goes again, at least for a year, so until now. Drive mainly work&retour = 2x 15 km tgl., but even after 200Km the battery is not far enough charged that all goes. In my opinion the undervoltage assistant is not mature /spinning, because it does not shut everything down before voltage is too low to start and something pulls vmtl. permanently current. Perhaps. Do the assistants/cameras/sensors….. also need too much during the ride why the short distance is not enough to charge? Does there possibly. Anyone else have an idea? Or else a recommendation for a new battery with large He’s got capacity, then I’ll trade it again.