Will Yeti completely drain expansion tank battery to charge itself?


I have a Yeti 3000 with 2 tank expansion batteries. I'm wondering what happens if I have a heater running overnight in my van and the Yeti drains the tanks to keep itself charged (I think that's what it does?). If it's unattended (I'm asleep), will it empty them completely and so impair the life of the tank batteries or does it manage the drain on the tank battery to maintain it's life (i.e. stopping at 50% or 20% or 10% remaining)?

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