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A "mini type" is a 7-cell pack, or 8.4V. Guns with limited space are designed to take the specific pack as Marui sells it (with Sanyo Cadnica 600 mAh NiCDs). If this is the case with the 552, get the Intellect 8.4V pack instead. With the specs it has it should still have little trouble turning over your upgrades, unless you're trying to push a 200% spring with standard gears for instance.
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