Winter Caching in Geocaching topics Posted January 10, 2009 Check your user manual before using those! The manual of the Garmin 60cx specifies never to use them. I believe that's because they give a bit more than 1.5V when new, which is bad for electronics not designed to take higher voltages. The 60csx will protect itself against high-voltage by shutting itself down. I can confirm that the 60csx will shut down automatically if I insert a fresh set of lithium AA batteries. The solution is easy. I usually use the lithiums when it's really cold out (because I am a cheapskate, I use NiMH rechargeables in all cases). I have found the cold reduces the voltage enough that the 60csx won't shutdown. If I need to start in mild conditions but then expect it to get very cold, I have found I can put the lithiums in a flashlight (or another GPS) for just 30 seconds. This will lower the voltage enough that the 60csx is happy with the voltage. Maybe this is a feature/problem with only the 60csx? We have never experienced our 60cx shutting down after installing fresh out-of-the-pack lithium batteries even in warm, dare I say HOT!!, gulf coast weather. We swear by lithium batteries and feel they are well worth the extra cost.