I have a ciggy lighter socket on my V-strom, which ain't a whole lot of use to me as my satnav mount is hard-wired and everything else I use needs a USB socket. And I don't smoke. Question: if I buy a USB adapter for it, how likely is it that my iPhone or bluetooth comms unit will get fried if I try to charge them from there? I have no clue how reliable these things are are; do the devices themselves include any form of protection against surges(?) etc etc?