The battery life of a portable photo printer varies depending on the model and manufacturer. The battery of Liene's portable printers provides enough power to print 30 photos on a single charge. To extend the battery life of your portable photo printer, it's recommended to turn it off when not in use, ensure timely charging, and check the battery status before use. If the battery shows significant performance degradation, you might consider replacing the battery or exploring repair options provided by the manufacturer. If you're looking for a longer battery life in a portable phone photo printer, it's a good idea to check the product specifications and user reviews to find a model that meets your specific needs.