I have the same setup as Paul, and it works fine. However, I have a 302
-- when I had a Volkslogger, this setup would create two separate IGC
files when you switched from one battery to the other.

I agree as well.
I used to switched an L nav on each flight with no problem.
Now that I use a 10.5 amp/h battery I rarely switch.
Hence I only have to take out one battery for charging.
I would use the same battery for about 5 flights and then rotate.
Udo