I tested them all and they worked pretty good. Board Input was 6.0 volts. The 18650 batteries (LIPO 3000 Ah and Lipo 1600 Ah) charged to exactly 4.275 volts and then the MOSFets (N-Channel -- U2) switched off the input volts.
With 2 car bulbs 21 W in parallel ==> 2.02 amps, I discharged the 18650 batteries and the bulbs switched off at 2.800 volts. That's exactly what the specs of the TI-IC bq29700 say.
To turn the battery the other way (P-Channel -- Q1) around into the position plus pol to minus and minus pol to + ==> I did not testet yet. I will do it as soon as possible, too.
The protection guard is a very good product. I bougth the last 5 boards and i am really happy