That bogolighe looks neat. Find a way to mount it on your handlebars and it could be a winner, especially if it offers enough illumination.

There are several solar battery rechargers available. Some of them are reasonably priced. Of course, you would have to either go through the trouble of fiddling around with the batteries, or re-wire the unit so that you could toggle a switch to run off of the batteries within the unit.

I think that cost has to be a factor because gear on bikes tends to either get ripped off or broken.

Here is a Solar battery recharger that can use most rechargeable batteries. I have never used this unit and cannot attest to how well it works, but it might not be a bad idea to have one of these strapped to your rear carrier as a "fresh" battery supply unit. For purchase, you can go to http://safetyfirstdmk.stores.yahoo.net/solbatchar.html