Introduction
This label printer has some Lithium-based battery, which is usually charged when USB is connected. In my model, the Usb charging was not able to provide the necessary voltage to actually charge the battery. This makes it impossible to print, as the current draw of the thermo-printing element makes the USB supply voltage drop so low that the controls reboot the device.
Parts
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Remove the original battery. It is housed near the hinge of the device. The battery compartment opens using the latch marked in red
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Once removed, use a 9V-block to replace the original battery. The "-"-contact should be the one in the front, facing you. This is the bigger contact marked with a red circle.
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Since you already have a label printer on hand, it's a good idea to stick this polarity information next to the compartment for future reference. E. g. "'-' in front"
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Since the 9V-block is smaller than the original battery, wrap it in some bubble wrap or similar. It is also shorter, so add some cushioning to the top of the cavity.
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The original won't charge, so replacing it with an OEM replacement is likely futile.
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If you are only printing labels once in a blue moon - take out the battery for storage. You can conveniently store it in the compartment with the contacts flipped towards the top.
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