Thanks for your reply,
Finally I have ordered that :
- Carte chargeur LiPo Pro POW12059P :
http://www.seeedstudio.com/depot/LiPo-Rider-Pro-p-992.html
- Cellule solaire SOL3W :
http://www.gotronic.fr/art-cellule-solaire-sol3w-18996.htm
- Accu Li-Ion 3,7 V 2000 mAh : h
The LiPo charger / boost is rated to 5V @ 1A. It is probably a bit low for
charging a cell-phone AND driving a couple of motors reliably.
I don't think the way you intended to connect things would work, since that
board probably won't pass the USB connection through, but only happens to
use USB
