Here is a hot glue job I did yesterday. About every 3 to 4 years I have to change the battery to the doorbell for the train room. Kind of a special size. A23 - 24 volt Alkaline for this wireless doorbell. The bell part is in the basement, near the layout. A cordless hot glue gun is the best way to go & I have a lot of RYOBI power tools. All the batteries are interchangeable.
The replacement glue sticks are sold everywhere like hobby shops & hardware stores.
Gary - Hope to see you out rail-fanning. 🚂