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If the vacuum cleaner only runs for a short time, the batteries are exhausted. The batteries are readily available, but you need to be good at soldering to replace them.
You will need three 18650 batteries with U-shaped soldering tabs and a voltage of 3.7 volts.
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Remove all attachments, leaving only the base unit.
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Unscrew the five Phillips screws.
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You have to disassemble the device into two halves. To do this, cut the sticker at the seam with a sharp tool.
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Take a plastic lever tool and carefully split the device into two halves. It probably is stuck a little.
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Now is a good time to give the inside of the appliance a good clean, especially all the foam filters.
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The batteries - shown here in green - are easy to see. They are held in the device by rubber buffers.
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You need three 18650 batteries with U-shaped solder tabs. The higher the capacity, the longer you can vacuum. Use types with a nominal voltage of 3.7 V and a charging voltage of 4.1 V.
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To be on the safe side, measure the voltage of each cell. They should all be the same.
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Carefully lift out the batteries. A fuse and a thermal sensor are glued to the first and third battery.
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Remove the adhesive tapes and carefully push the fuse and the thermal sensor to the side.
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In the third picture you can see the thermal sensor. Note how it is guided through a groove in the rubber buffer and rests against the battery.
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All solder joints are secured with heat-shrink tubing. Cut all heat-shrink tubing with a sharp tool and remove it.
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Now comes the main work: soldering. Get some wide heat-shrink tubing that fits over the soldering tabs.
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Desolder the old batteries piece by piece - you can also pinch off the cables - and solder them to the new batteries in the same way:
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Slide on suitable pieces of heat-shrink tubing before soldering.
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Heat the heat-shrink tubing until it tightens against the soldering tabs.
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Tape the fuse and the heat sensor in place with insulating tape.
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Insert the batteries.
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Check the polarity of the batteries once more.
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Minus
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Plus
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Switch on the device for testing.
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Work through the steps in reverse order to reassemble your device.
Work through the steps in reverse order to reassemble your device.
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