One battery is in series
This circuit is a series circuit
The light will be dim
One battery is in opposition, it slows down the flow of electrons.
Remark: The lightbulb isn't going to light up.
Evidence: This circuit is parallel in nature and has just one battery.
Reasoning: If one part of a parallel circuit fails, the others will still function as each part has a separate path to the battery. But since this circuit only has one battery, if it dies, the lightbulb won't light up and the circuit as a whole will collapse.
In summary, the single battery in the circuit prevents the light bulb from turning on since a parallel circuit needs two or more batteries to run. The circuit as a whole will malfunction if the battery dies.