When it came to charging I attached my unit to a usb sync cable and left it to charge. However no light came on and I was worried that the connection was not working properly. My Wizard had no charge too so I couldn't turn on to check. I decided to attach to my mains charger and let it top up overnight.
The next morning - still no charge! At this point I was starting to panic. The unit would not respond to anything and would not show it was charging. Agghhh! I went online and found (via howardsforum) that this has happened to a number of other users. Apparently if the charge left in the battery is too low then it will not even take charge!
I tried everything however the only way I was able to charge the battery was to remove it from my Wizard, strip down a USB cable and charge using the bare cables (try at your own risk!). My battery then charged up enough for me to then insert in the machine and the battery to then top up as normal!
So the moral of the story is - don't let your battery run down too low!