I’ve had 12v problems twice in the past two months. The second time. I got this battery protection limit notification. The dealer said I wasn’t using my car enough, hence the battery drop.
I chatted to the service manager and scoured the web. The manager agreed that it needed a trickle charger on the 12v battery. I’ve bought a Nico genius 5. Not cheap at £79.99. But I’ll be trying this when I’m not using the car for more than a few days. I’ll post back in a few weeks. The manager said they’d charged the 12v battery and it seemed better. Doors opening by grabbing the handle etc, which it wasn’t doing.