Dear Biggles,
you might want to try a PSP(playstation portable). They need no extension lead's and the battery should last for about 6 hours. That's a really good day's riding full of realism! IMO
Tell all your mates about them, and you could start a new motorcycle club - PSPMC??? Actually im copyrighting that, so think of your own mc group name....
Hope this reply help's your problem of your extension lead's.
Regard's
Mr N.J.Tank