What are the differences between Proto #1 and Proto #2?

Proto #2 is slightly smaller than Proto #1, has some performance improvements. Also, Proto #2 features an attached rechargeable Li-Ion pouch battery, whereas Proto #1 uses a rechargeable Li-Ion coin-cell (removeable) battery.  Otherwise, they perform in the same way and use the same SDK.

Proto #1 Soliton

Proto #1 Soliton

Proto #2 Soliton

Proto #2 Soliton

Proto #1 - removeable rechargeable coin-cell battery

Proto #1 - removeable rechargeable coin-cell battery

Proto #2 - attached rechargeable pouch battery

Proto #2 - attached rechargeable pouch battery

Proto #2 - charged with included USB charger

Proto #2 - charged with included USB charger