Thread:Affectos/@comment-24588058-20161220053559/@comment-24588058-20170306195201

Correct, in the original series there was a bit to it with regards to how long the Omnitrix stayed active versus inactive. Each transformation lasted between 10 to 20 minutes (usually dependent on whether or not the user was actively fighting someone, after which was a five minute recharge period (unless the Omnitrix was meddled with) was used. The one exception was that if the user's life was in immediate and life threatening danger (the two examples shown in the series were Kevin trying to tear the Omnitrix off of Ben's arm and Ghostfreak trying to possess Ben, each occurring less than one minute after detransformation), the Omnitrix instantly recharged to protect Ben, allowing him to transform to fight back.

I like the origin you propose. A toy makes a lot of sense. Though changing the batteries might be troublesome, but understandable to because of its origin as a toy. But I would like to propose the possibility of instant recharge under the specific case of the user being in immediate and life-threatening danger.