Does anyone have any experience with these devices? I purchased both devices as part of the Kickstarter program. Run them in the RV. The day before yesterday, the SBV4600 failed. Capacity abruptly from 89% to 0%. Dead ever since. Does not charge via mains and also not 12V. The satellite is at 90%. Is there no balancing between the two devices? Zendure replied with a ticket (inbox). I'm looking forward to your feedback. Horni