Originally Posted by
Ziemas
Stay away from the Mars 3. While bright, it's a major pain to change batteries due to the fact it uses three tiny screws to access the battery compartment. The Planet Bike Super Flash is a good alternative.
The Mars 3 is like the old Vista taillights (same maker with a different name). The threaded compartment isn't that big of a deal, however. I don't use rechargeables in my taillights because of the self discharge of rechargeable batteries so I only have to change mine about once a year. Not a big deal, really.