Bad news - During dry fire practice my CTL batteries started to die. Good news - Contacted Crimson Trace and new set of batteries are on the way under the Batteries for Life program.....batteries and shipping costs are free for my life. Great news - A while back, they had already sent me a spare pair that I held in storage and immediately installed. I always have new batteries ready to go. Even better news - The batteries that just went bad lasted me over a year with regular dry fire practice... and my CTL has been totally reliable and dead on, for the past 4 years. Zero problems. Great product and support from CTL. Extremely useful device.