Hi Allen,
Thank you for the info. Made a APRS tracker for model rockets using a TT3 chip. Going to put it in a small rocket with a single 250 mA lipo cell - it only has to last 30 minutes.
A lot of the raw cells you can (like 18650) are brand knockoffs. They may not have the advertised capacity, but sounds like the ones you got still have a proper protection circuit included. "Protected" cells have a over charge and under voltage shutoff - good stuff.
Eric Oberg