Most flashlights die because their contacts corrode. Especially those not used frequently. They die on you when the emergency hits. For this reason some manufacturers use gold plated contacts. However, I was not able to see this in the description and features. Can you confirm and/or provide a reference answering if the contacts are gold plated?
ElcanoGet a flashlight that allows you to slightly unscrew the tailcap and stick in a modern NiMH battery. You could leave it in your car fora couple of years and it *should* still be ready to go for a decent amount of runtime.