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My X20 battery was dead after I accidentally did a short circuit.
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To open it, unscrew the 4 screws at the bottom.
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The '+' contact was melted and weld shut, and the fuse on the board was blown.
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I unsoldered the pcb with the help of some good solder wick.
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To avoid more short circuits during soldering, I covered the surrounding contacts with painters tape.
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There is also a thermistor which needs to be unsoldered to get the pcb off.
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After unsoldering, take the pack out of the case to unplug the display board and take off the pcb.
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After the pcb was off, I unsoldered the broken contact and one of the middle contacts, which are only used with small currents.
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I replaced the broken contact with the good one and used a Dremel to cut off the solder pins of the broken contact.
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Then I soldered a car fuse holder terminal on top of it to create a replacement for the middle contact.
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I also cut a slot into the back side of the plastic holder to get some strain relief on the replaced middle contact.
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Then I added 2k glue to fix the contact even more.
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I unsoldered the broken fuse and replaced it with a mini fuse holder.
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I used 1.5mm copper wire to get a good and rugged joint for the fuse holder.
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I also made sure that the fuse holder is mounted so that it fits properly into the case.
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As the battery is capable of delivering high currents, I put in a 40A fuse.
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After the replacement work was done, I put everything back into place.
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Do not forget the thermistor contacts before soldering the battery contacts.
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Also, don't forget the screws which hold the pcb and plug in the display board before putting the pack back into the case.
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As always, it is good advice to gently turn the screws counterclockwise to sense the proper fit of the plastic thread turns, before screwing the screws in.
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