But it's more energy-efficient, with a new Bluetooth 5.1 chipset. However, what's interesting about the Boombox 2 is that is has a smaller 10,000-mAh battery than the original, which had a 20,000-mAh battery. And on the outside, JBL didn't change much. JBL's second-generation Boombox 2 doesn't really look different from the original.