I wondered about that too then I realized what an anodeless battery would really, literally mean: if you charge it, you pump electrons into it, so it gets somew

I wondered about that too then I realized what an anodeless battery would really, literally mean: if you charge it, you pump electrons into it, so it gets somewhat electrically negative, and if you discharge it, you let the electrons flow out of it. To be pedantic, this is not really anodeless, this would be just a battery having only one electric contact switching roles between a cathode and an anode. Then I started to wonder: what if this really could be done? I am afraid not, because you need two contacts to create a potential difference, don't you?