Every Christmas come in my flashlights new high quality batteries, the old ones are then consumed by the Christmas lights. Apply a drop of oil to the thread and they are reliable ready throughout the year.
Aja if you should not touch the bulb but they hold a handkerchief exchanging the bulb, which increases the service life enormously. (That has to do with cooling and light bulbs Internal chemistry)
My recommendation to buy, ideal in combination with a no-name LED Flashlight