- 100 mils longer profile to let USB overhang the breadboard if needed
- extra pins prevent misalignment
- +5 V USB output pin
- fancy new logo and layout optimized for clear silkscreen on black FR4
- 100% of parts on PCBA now have 3D models
- uses a single, cheap, easy-to-source 16340 lithium-ion battery
- supplies 3.3 V at up to 2 A
- on/off switch
- on/off and charging LEDs
- built-in thermal and short-circuit protection
- microUSB for charging
- auxilliary +5 V input for charging
- USB +5 V available to breadboard while connected
- silkscreened labels on pins
- open source design with bill of materials