The V1.5 is indeed more rocket friendly. V2 is great as an indoors device.
If you use mainly power mode, the suggestions above are great. Minikin's doesn't fare so well in the Temperature control department, but other than that they are great all round devices. Would also recommend the V1.5...
Also complains about the magnets. There are a lot of complaints about the battery issues online also, I'm sure this could be solved by a firmware update, not sure why the manufacturer would take this long to release new firmware though.
As the batteries are connected in series one battery will always drain a little more than the other. Not by much though, like 0.2V maybe 0.3V max. It is recommended that you swap your batteries around every charge. By externally charging this probably occurs naturally.
The firmware on the V1.5...