Yeah, pretty sure that might've fried something. I suppose it works for simple stuff like a fan or light, but anything sensitive to voltage might get fried if it expects 5 Volts and gets 9 Volts. Actually, maybe even the light and fan might have a somewhat shorter lifetime, depends on what the tolerances are. Light and motor would probably burn out faster though.
Perdonen mi ignorancia, tengo una duda y es esta, acaso lo bancos de bateria no se conectan en serie aunque tampoco le veo el problema en que esten emparejados realmente no veo alguna diferencia de su efectividad aun asi son funcionales ambas.
