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Al, sent your question to Streamlight, serial number will not I D the light, but they said if you have a 20X light, you should need a 20170 battery stick, which we have in stock. 1 more question to you, is your light a metal or poly material housing?
If this were my light I would use the same number battery that came with the light, before I would stick something different in there. Besides there are 3 or 4 model SL-20 lights, what model number is yours? If you don't know then send us your serial number off the light.
Jodie, this stick is 9" long, you should send us the serial number of your light, and model number and we can trace those to get you the correct battery.