The Pro 2 was notable for having an easily replaceable battery pack which was also compatible with standard AA batteries, and now the Pro 3 will be removing this feature in favor of an internal battery. I was implying that although the Pro 3 includes a new hall effect sensor for the triggers which would marginally increase its lifespan, the Pro 3 will likely need to be thrown away sooner than a Pro 2 because of its new irreplaceable battery design.