Hi MPL,
1. Normally, you can just left the setting on mode 2 since this will charge the battery faster. However, just use mode 1 about once every month, this will condition the batteries to keep them at optimal performance.
2 / 3. You can take the battery out of Power Bank if you don't plan to use the Power Bank for a while. With the current battery technology, the battery will drain slowly even if you don't use it. If you plan to use the Power Bank on daily basis, then we recommend that you just leave it on the AC outlet for trickle charging. This way, you can have a set of fully charged
batteries every time you need them.
4. Do you keep the Power Bank plugged into the AC outlet? If you do, the battery should trickle charge the battery to keep at the optimal level.
5. It does not matter. Mode 1 or 2 is for charging the NiMh batteries. It has nothing to do with Dell Axim.
6. If you set the setting to 2, it shouldn't discharge the NiMh battery. However, the battery will loose power overtime even if you just leave it in the air. That is why the Power Bank is designed in such way so that it will trickle charge the battery when left on the AC outlet.
Regards,
Support Team,
www.semsons.com