As you may have seen from the RC car mods posts, i had to add a voltage boost module in to get it working. While it worked perfectly for that purpose i was skeptical of the claimed specifications – as you should be when buying cheap stuff from ebay.
Here is the details from the ebay auction:
Input voltage: DC 3-4.4V
Output voltage: DC 5.5V
Output current: 700mA (max)