I have 6+ of the CMG Infinity Ultras in my family. I bought one for everyone in my family. 90% of all electrical problems are caused by a bad connection. Take a wooden pencil with a good eraser and clean the contacts at both ends where the battery will make contact. Make sure you keep cleaning the eraser on your pants or something so it stays clean. When you can rub the eraser on the contacts and it does not turn black it is clean. Then try the new Panasonic Oxyride 1.7 volt AA batteries. I put one in my Infinity Ultra about a month ago and it is still super bright. I also have to put some lube around the O-ring to make it turn easy. I have not tried the new Gerber.

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