And another article, the one i saw first:
http://www.theverge.com/2015/1/5/7484171/gogoro-smartscooter-electric-scooter-removeable-batteryThe 60 mile range claim is almost certainly at urban speeds, 20-25 mph. Figure 50 Wh/mile, so about 3 kWh, 1.5 kWh per module.
Assuming the modules are using NCR 18650s with lightweight casings, then each module should weigh a bit less than 20 pounds.
Suppose an urban rider rides an average of 300 miles per month (about what I'm averaging now). They'd need to swap batteries at least 6 times per month, or 1-2 times per week. Typical fuel costs @ 80 mpg for a 150cc scooter would be around $15/month, so that's in the ballpark for the battery rental cost Gogoro would need to target. 15 kWh of energy costs only about $1.50 in the US.
A Honda PCX 150 retails for $3500. A Vespa LX 150 is $4500. Figure $15/month * 8 year lifetime = $1440 only, so Gogoro would need to be able to build the entire package for around $5000 to $6000.
All numbers are speculation, they haven't given out much hard information. Seems like a tall order, but installing battery swap locations every 1 mile or so (they'd need 20 to cover central Nashville, though we're surely not the initial target market) might work in dense locations, somewhat alleviating concerns about range. Like Tesla, they would need to be very responsive and install new stations as demand ramps up.