about the AA batteries for the Dinotte. strongly suggest rechargeables. you will go through a ton of batteries otherwise. I have 200L as my headlight on helmet. Commute daily and go through the battery in short order every other day to recharge. AA's are about 1.5 hours run time for me YMMV. Regardless what everyone says about do it yourself lights I went with Dinotte. yes $$ but I don't care. I had a Trailrat 2.0 and the battery died twice in the year I had it. They did replace it the first time but 2+ weeks waiting for a new battery was not acceptable. I did not bother this last time I replaced it. I now have a new Dinotte 400L dual on my handlebar to replace the Trailrat and wow does it light up the night. Even my Dinotte 200L was several times brighter than the Trailrat this 400L is truly amazing. Now I can ride at any speed on my commute and see the road clearly. My safety is more valuable than skimping on cheap lights.