Two different battery chemistries mixed in one bank

Mixing battery chemistries (lead-acid and lithium, or even different ages/brands of the same chemistry) in one bank is one of the more common mistakes I see, and it usually shortens the life of whichever battery is weaker while also creating charging profile conflicts, since lithium and lead-acid want different charge voltages entirely. If this is already your setup, it's worth a real conversation about whether to separate them rather than continuing to run mixed. What's currently in the bank?