Skippic, in your schematic, I think the power resistors are not necessary. The current will be limited by the AC capacitor. It also seems the output caps are not necessary either.
You might want to power your 5v supply directly from the line too, as the output side voltage could vary over a wide range. A old cell phone charger works well for this.
I'm using them for now, I get much flatter charging current, but might omit them in the future if anyone confirms, that there really is no damage to the cells in the long run. I remember a Headway charging setup, that did emit sound (not good).
For the 5V I'm using a phone charger, but it also works powered by the battery this way. In the future I intend the charger to be a part of the battery pack and I'll use the Arduino as CA while riding.
Thanks for the hairdryer and wall GFCI suggestions. I hope I'll find a 220V one.
One more question related to the charger, what's the best rectifying bridge to use? The one I have has 2.1V forward voltage and heats up pretty quickly. I looked online for solutions.http://www.ebay.com/itm/180613576821?ss ... 1423.l2649
Is this a good idea or is there a rectifying bridge, that would come in one piece?