  We propose a novel quantum battery realized with a few interacting particles
in a three-well system with different on-site energies, which could be realized
with ultracold atom platforms. We prepare the initial state in the lowest
energy well and charge the battery using a Spatial Adiabatic Passage
(SAP)-based protocol, enabling the population of a higher energy well. We
examine the charging under varying interaction strengths and reveal that the
consideration of collective charging results in an intriguing oscillatory
behavior of the final charge for finite interactions, through diabatic
evolution. Our findings open a new avenue for building stable and controllable
quantum batteries.
