The Solitaire or the AAA Mini-mag?
If the latter, the Nite-ize LED adapter should work in your light. I put one the MiniMag that lives in my EDC bag about a year and half ago- I haven't had to change batteries yet. While it is admittedly a spare light, historically it went through a set of batteries every six months or killed a bulb from impact. They run about seven, eight bucks.
And it is a LOT brighter as well.
If the Solitaire.. they work, I carry one on my keys and in one of my kits. I keep looking for something better that isn't a coin cell though.
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-IronRaven
When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.