I use nimh batteries for this one. It was working fine when I got it but then it started having problems. When I try to turn it on it wont turn on and I have to turn it on and off a couple times for it to light up. Sometimes if I turn it on and wait, usually it will come on after about 3 seconds(not always 3 seconds it varies). I have cleaned every thing with a toothbrush and alcohol and made sure the switch assembly was tightened, the head and tail caps too. I have tried a new nimh battery same result and an alkaline(not new from a remote, couldn't find any new ones )