Etrex battery problems in Motorcycle GPS systems are usually caused by engine vibrations.
As the engines on many motorcycles will cause the batteries to be jarred, the system may shutdown while the cycle is in operation. This can cause a wide variety of issues for those who are attempting to make use of the system.
There are several solutions to this problem, however.
The simplest solution, although considered lame by many, is to wear the GPS unit on your body. This allows you to have the benefit of the device without the problems caused by the vibration of the engine.
A second solution, and usually the most preferred, is to hook the GPS system to the motorcycle, completely bypassing the use of batteries. This is an acceptable solution for ATV GPS systems, as well.
If you suspect that you have Garmin Etrex battery problems, there are several ways that you can confirm the source of the problems. The primary identifier is the fact that the GPS system stops functioning when the motorcycle is turned on.
When it ceases to function, the device should seem to fade in and out before completely dying out. When the device is removed, and the batteries taken out and put back in, the device should resume working as intended. If this occurs to you, you should first try to bypass the battery.
If you are uncertain of how to do this, you should contact an on line dealer for more information. They will be able to tell you exactly how to bypass the battery so you can make use of proper GPS mounts with your motorcycle or ATV.