[Marvin]

Originally Posted by Spihc

1. Looking at lipo chargers I have stumbled upon so called "adapters" for balancing, what are these and why?... How do I know what connectors my future cells have?

There are four main types of balance connectors:
JST-XH (or Align), TP (for ThunderPower), PQ (Polyquest), and the weird ones that LRP/Nosram use.

The first three are common connectors, whilst I've never seen a Lipo, other than an LRP/Nosram one that uses the last connector.

The PQ plug is not that popular for car use and the JST-XH is the most popular.

Originally Posted by Spihc

2. The power supply thing... I heard that one can use a pc Power Supply, but a "normal" would be prefered, like this, http://cgi.ebay.com/Power-Adapter-12...d=p3286.c0.m14, would it work??

That will not really work. It can only provide 5A to the charger, which will need something more like 5-6 for the peak part of a charge. A better choice would be something like this. It can provide 20A, at 13.8V and can be used for other things like soldering irons, which won't run on your linked item.