No problem Magne,

Leave your packs fully charged. I for one, will no longer do it because I've seen the results after a week or two left fully charged.. Your choice.
FWIW I only charge my receiver packs to 95% now as an extra precaution. If I don't fly due to weather etc, I will discharge the pack down to 3.8V/Cell.

Your mobile phone analogy is mute because a mobile is still drawing current even while switched off.

At the end of the day RTFM (Read the friggen manual) for your batteries. Follow those instructions and you should be fine.

Cheers,
Jason.