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Word of caution for when your receive your lights. I did the Ti version drop and recently received it. I hurriedly pulled the battery insulator sticker off, put the tailcap back on, and the light would not work right away. It did work after just waiting 10 minutes and continues to work fine. I believe that the electronic switch on these lights use a charged capacitor as the power source of the switch, and the capacitor must be charged from the battery. In shipping, the battery is insulated, capacitor discharges over time during shipping, and you then might think you got a bad flashlight when first trying it. Just give it 10-15 minutes before clicking away on the switch when you get it.
The same happened to me with my titanium version but it only took a minute or two to charge the switch. At first I thought it was broken but after it started working I remembered reading that there was a small capacitor or battery in the switch. I've never had an issue with it since then.
There is actually a small rechargeable battery in the switch that needs 15-20 minutes to charge after you install the aaa battery in the light.
A follow-up note: My light activated in my pocket and fully drained the AAA battery yesterday. It also drained the capacitor (or battery) in the switch. It gave me a chance to measure the recharge. It took about 5 minutes after the AAA battery change to restore partial operation. By that I mean that it turned on, but the light was not full brightness and could not be adjusted by cycling off/on. Following about 10 minutes, it was fully functional and could change levels again. I would say try to avoid running the battery dead when in use or you may have a 10 minute wait to sit through in darkness.