I am now the proud owner of a Schulze LiPo Card 2 field charger. It can charge one lipo pack at a time, up to 4 cells and 3850 mAh charging current. The beooootiful thing is that is has a built in balancer and auto-detects cell and battery type when balancer is connected. Very nice gadget to carry in the field box now that LiPos are used for receiver batteries in many of my models.
And the best thing is, it can run off anything from a 13,8 volt PSU or car battery to a 3-cell lipo battery using the low-voltage setting.