2019 Rav4 Hybrid AWD

My question is in 2019 Rav4 Hybrid model, rear is totally disconnected from the front and if you don't have enough charge in the battery (or after travel off-road for a while until battery is drained) then it will become FWD, will this be a real big problem in snow, I know if you really want to go off-road it's better to get Adventure, however I have this question as there is a time hybrid AWD will be no more AWD. ? And how does the battery providing power to rear will get recharged ?