Replacing Philips FC 6148 handheld vacuum cleaner batteries

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Remove all attachments, leaving only the base unit.

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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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The batteries - shown here in green - are easy to see. They are held in the device by rubber buffers.

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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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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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Tape the fuse and the heat sensor in place with insulating tape.