That is sort of why I've not jumped on the lithium ion based keychain lights as the built in chargers take up space that can be used for more battery capacity. If you look at the watt hours of a light with a 10180 that is smaller vs a AAA you find the 10180 may get you brighter light by a lot but at reasonably useful lower output levels the AAA deals out 2-4 times the runtime. For occasional use either light is fine but when it is a backup and your primarily light fails the smaller battery can run out of juice and since it is a non standard cell you have less options.lumitop nano gt. there is way more room in this thing to add more battery capacity even if its non removable 80 mah is just silly