Nintendo Switch: 4310 mAh battery
Nintendo Switch Lite: 3570 mAh battery
So, it seems like the rumors of a new CPU are true. Smaller fan and vent, smaller battery, and improved battery performance. What will definitely be interesting is when people take them apart and also run tests on the system. I'm curious how the clock speeds will differ, if at all.
Also, someone asked if the Pro Controller works. To answer your question, yes. The Switch Lite still supports Bluetooth.