You start with 2, supercharged gives your 4. If you want to hold 5 stacks then equip another charged mod.
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Strange... but then anyway it's buged coss before changing the gear (I stick with my set that I never wear off from previous season, before BL) I always get up to 5 charges by just picking orbs of power from the ground.
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You would have to equip 2 charged mods for that to have been possible.