You're right, the CampStove 2+ has a battery capacity of 3200mAh. There is an incorrect product marking that shows the battery capacity as 2600mAh. The product packaging and instruction manual show the correct battery capacity of 3200mAh. We're so sorry for the confusion!
In order to identify a CampStove 2 vs CampStove 2+ powerpack, please use the product serial number, which appears on the inside of the powerpack below the battery marking:
Legacy CS2 serial number format: "CSC XXXXXX"
Updated CS2+ serial number format: "05 XXXXXX"
We're so sorry for any confusion this may have caused, and we are working with our manufacturers to correct this issue.