12 volts last long. We never use 5 amp batteries in our 18 volt versions. Lots of power for standard silicone / DOW 795. Makita barrels are good but expensive to replace. DO NOT use them with dented barrels or the inside will get dirty. The auto stop works well and material stops coming out of the gun when the trigger is released. SIGNIFICANT increase in performance over handheld power weapons.
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