I've used several AAA-battery rear flashers and haven't found one of them that was truly waterproof. So, does anyone have a recommendation for a decently bright flasher, with either AAA or rechargeable batteries, that will tolerate exposure to a lot of rain without leaking and ruining the batteries and electronics? I found the Dinotte rechargeable but at $190 I'm not that interested.

A search here didn't come up with any recommendations so can anyone offer a suggestion?