New electrochemical battery recharging, refurbishment and replacement techniques are provided. In some aspects of the invention, small, fungible battery elements may be immersed in a fluid and delivered via a bifurcated pump interface that simultaneously unloads discharged cells and loads new, charged cells, to accomplish rapid cell replacement and recharging. The cells may be magnetically aligned to bring cathode and anode elements together, in series, and bridge contacts within a container (powering an appliance). Density differentials between charged and discharged elements may aid in placing them in series (with similar charge states and capacities) and in removing them during replacement.In other aspects, electrode elements may be rapidly flushed to accomplish rapid recharging, in a staged process. Aspects of the invention also provide for rapid exchange of larger, streamlined battery elements, without the use of an immersive fluid, and systematic control of recharging balances accomplished by such exchanges.