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120 at the alien crash site, theirs also some in the basement of fort independence (brotherhood outcast base)and 24 at the random alien crash encounter alon gwith the fire lance. also if you have the broken steel DLC add on thiers some more alien power cells and another alien blaster in the armory at the mobile base crawler , and you can also find some in the Alien Mothership in Mothership Zeta.

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