Yes I have had me a long time to0. I just bought a Garmin 2460LT and it is top shelt stuff.
To replace battery unscrew unit and prize out batt from the potted bed of clear silacone and un plug from circuit board. The carfully clean out residual silacone and replace battery in GPS housing in the same position with the same amount of dobs of silacon and screw the two half back together again with great care. Battery available from