The PowerBook 150 replaced the 25MHz PB 145b. It offered the faster performance at a lower price and was the final model in the 140-145-145b-150 line. It was also the lightest of the line and its battery rated at 2.5 hours, about 30 minutes longer than previous models. Finally, the 150 sported a 640 x 480 display, the same size as a regular monitor.