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Why do some laptop chargers have three prongs? I get in 2 prongs there is one for positive and one for negative, but why 3? Thanks in advance, sir/ma'am. - Quora
battery - I recently bought a replacement charger for my laptop, but I'm worried about the polarity - Super User
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battery - I recently bought a replacement charger for my laptop, but I'm worried about the polarity - Super User
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HOW TO HACK CHARGING ADAPTERS TO POWER OTHER DEVICES. - YouTube
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What are the positive and negative on this cable? It looked like a circle inside of a circle when I cut it open. The small end also has some metal in it.
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BU-911: How to Repair a Laptop Battery - Battery University
