Currently, from what I understand, Charge Stone has (presumably) unintended behavior that allows for doing things like holding a structure then un-holding it, still allowing the player to continue charging off the structure they no longer have hold on or otherwise allow the player to not be holding the structure after a charge has completed and, in both cases, still retain the charge to use on another structure. This is behavior used in "Charge Battery" techniques. As it stands, there is also additional inconsistency and unintuitive behavior with Charge Battery beyond what is described here.
I suggest that this current behavior be removed and replaced with a 5 second long (or longer/shorter if that amount of time seems too long or too short) lingering of the charge buff after the structure affected by Hold is destroyed or is no longer being held, but only after that structure is fully charged. This could allow for a more streamlined, intended integration of his behavior as a feature that could allow for those that have spent time learning to utilize the current behavior as a fairly large part of their combat style to still have a play style that works in a similar, albeit simplified direction. Ideally, I think this new lingering buff behavior should be combined with some version of previous suggestions for a visual effect that indicates the charge is on the player instead of the structure and have that visual effect linger for the 5 seconds this buff is active.
Note: this may constitute a buff to Charge based play styles not specifically utilizing charge battery type behavior currently, as it more opens up more general usage of charge for a short period after the structure is no longer held.
Thank for your consideration!