Why does N97 charge from some USB port and some no...

OK some seem to have same sort of troubles but I couldn't find an answer to this one...
So I have a N97 that charges OK when I plug it in computers USB port or in a (powered) hub.
But I also have a USB power adapter that I can plug in a wall socket and it has one USB port (5V/1A) and nothing happens.
Same happens when I plug it in my car using a USB adapter (not a actual car charger for N97).
Since every other phone/MP3-player/device that can be charged via USB works with these, I have to asume that this is something with my phone...
Has anyone else faced this and have found any solutions?

OK I have some additional info to this one.
I made some experiments with different chargers and cabels and here is the most interesting result (in my oppinion)...
In both cases I used my N97 and the USB power adapter (with 5V/1000mA output).
Only difference was how I connected the two...
By using the data cabel (Nokia CA-101) that came with the phone and nothing it DOES NOT charge the phone.
(and yes it is working cable, since I use it to sync my phone with my PC and it does charge the phone via PCs USB).
By using USB->2mm plug adapter (Nokia CA-100) and the 2mm plug->micro-USB adapter (CA-146C) it DOES charge the phone.
Since CA-100 converts USB to more simple connector then there must be something more happening inside CA-146C than just relaying those wires forward...
Any ideas???
Attachments:
charges.jpg ‏289 KB
no_charge.jpg ‏404 KB

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