I've bought a couple of these, but to use in Variaxes which take 6xAA batteries when on open mic nights, so high consumption but short duration. I haven't yet assessed how long they last for.
It would be a bit tricky adding a charging cable when there's a separate battery compartment as there wouldn't be room for the plug in the battery compartment, or for the socket in the lid, and generally the hole between control cavity and battery compartment would be too small to pass the plug through so that solution is also precluded. Single compartments (eg later Warwicks) would be more feasible. But if the battery lasts a few months, it's not exactly onerous to take it out for a recharge now and again.