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We first prepare two or three bad batteries,

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and then prepare a pair of old test pens

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First remove the battery charging board

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Remove the plastic tab,

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and then flatten the battery board

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We add some tin on the weld position

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to burn off the battery board

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OK, the battery is removed

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Let's remove another piece

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The T-shaped head of the battery is soldered on with a soldering iron,

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we can't just rip it off from here

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If it is torn off, it cannot be soldered

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because it cannot be stained with tin

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So the T-shaped head has to stay here

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When cutting the lines, one is longer and the other is shorter,

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so that the two test pens will not touch each other

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and will not be short-circuited

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After cutting the wire, we put tin on the wires,

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which is convenient for us to solder

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The positive and negative poles of the battery must correspond,

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the positive pole is welded with the red wire,

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and the negative pole is welded with the black wire

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Put the two batteries together and flatten the position of the solder wire

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We clip the wire between the batteries and add a little tin

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After soldering, we add some more tin to the position

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of the two pads to make it stronger

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In this way, we have welded the positive and negative poles firmly

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Next we'll take tape and stick it up

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Okay, so we're done with the burning battery

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If the burning battery is dead,

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we can charge it with an adjustable power supply

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The power supply voltage is adjusted to 4.2V,

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the current can be 1A or the maximum,

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the positive pole of the power supply is clipped with a red test pen,

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and the negative pole is clipped with a black test pen, so that it can be charged

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When the adjustable power supply shows no current,

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it means the battery is fully charged