Wakeboard tower light - battery powered?

We are looking for a 360 - all-round - anchor - navigation light (whatever you like to call them) for on top of our tower.

I saw one from Barewest that is battery operated. Seemed like a good idea - no wires to run, etc. I'm not wed to it, it is pricey as well. I've seen the Perko - which could work and is around $30.

We have a tower from DIY. The tow-spool comes off - was wondering if there is anything that can be put on top of the tow-spool?

Any other battery powered options out there that folks have found?