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Hauk The negative pole is a large copper skin. The heat dissipation is quick, and the inexperienced person will use the soldering iron to keep warming on it for a long time. But the positive , the copper skin is small, and the heat dissipation is slow. Generally, the solder is melted faster.

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Blakinas What battery you used? 4s, 5s or 6s, and how much mah

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Scotty Ihave had the same problem.

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