I have also started the project, too
http://talk.maemo.org/showthread.php?t=91895&page=3

The problem with the story is the following:
The board what I bought, the charge can not keep up.
However, if you use 2 boards, then the charge is very good and quite fast.

If we compare times your board with my:

Power Cell: 3.3V input
Pulolo: 2.5 v-5v input

Cell Power: 5V @ 600mA max
Pulolo: 5V @ 400/500mA

The smartphone itself has a shot of 1000mA. That's why when I connect only a board, he comes after about 30 seconds, no longer with the charging

Therefore, the Board is very hot and overheated accordingly. When 2 boards that I use, charging is perfected, but still very hot.
Now it would be nice to know if the Power Cell is also very hot and only with a board charging perform continually.

The interesting thing about the Power Cell is that he has a Undervoltage lock with it. That is missing in the Pulolo boards.