As of my last knowledge update in September 2021, printed lithium-ion batteries were still an emerging technology, and the voltage rating of such batteries could vary depending on the specific design and manufacturing process. Traditional lithium-ion batteries typically have a nominal voltage of around 3.6 to 3.7 volts per cell.
Printed batteries are often designed to be flexible and customizable, which might impact their voltage ratings. However, I don't have specific information on the exact voltage ratings of printed lithium-ion batteries because developments in this field might have occurred after my last update.
I recommend checking recent scientific literature, research papers, or manufacturers' websites for the most up-to-date information on the voltage ratings of printed lithium-ion batteries.