+1 for this Ultrafire, I would humbly recommend this Ultrafire C3 for single mode, and this multi mode Ulltfire C3, in single cell mode, it can take 14500s for brighter light, but as your brother is 13, i would keep it simple in 2 x AA mode, it's also a lot easier to hold on to a 6 inch light than one 1/2 the length.
Duracell Daylite 2AA
Regulated Circuit- No continuous fading of light
Good run time
BRIGHT! 80 Lumens
Water Resistant
Lifetime GUARANTEE http://www.duracell.com/products/guarantee.asp
Less than $25.00
7" long
Reverse clicky
Can tail stand
Reputable company- Can be trusted
Available at Walmart- Buy it and try it same day and if you don't like it, take it back.
Nice Looking
Sturdy anodized aluminum.
Comes with batteries