Basic shield generator

This palm-sized, silver circle is powered by a basic power cell, which can be freely removed or replaced. It has 1 upgrade slot. A medium or smaller creature can use a bonus action to press the glowing blue button in the center and expend 5 charges from an attached power cell to have it generate a force field around them. Alternatively, it can make a 5-foot radius sphere around itself. As long as the shield is there, creatures and objects cannot pass through or enter its space. The shield vanishes after 1 min. or when destroyed. It is a small or medium object with an AC of 14, 15 hit points, resistance to bludgeoning, piercing, and slashing from nonmagical weapons, as well as acid damage, and immunity to lightning, poison, radiant, and psychic damage. If the force field would take lightning or radiant damage, it instead gains temporary hit points equal to half the damage and you make an attack roll against the attacker with disadvantage, using the original attack modifiers and dealing half the original damage.