GPS Electornics

Do you leave your the batteries in your GPS receiver all the time or take them out after a trip?

Garmin 62 owner's manual: "When you do not plan to use device for several month, remove the batteries."

My suggestion would be to check your GPS receiver owner's manual to determine this.  It may take a bit of digging to find the manufacturer's recommendation for your unit. 

The same applies to the use of lithium batteries.  When in doubt call the manufacturer.