US$29.99
US$29.99
0%OFF
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QHello, I bought this few months ago. Now I am using it with external 12V power. May I know can I still use it together with the internal 9V battery as a backup in case of power failure ? Thanks !
AIn general, we do not recommend external power supply and battery used together. Because the machine is used, will be heat, the battery is not always on the inside of the machine, and sometimes will appear oxidation problems. So we recommend that customers use one of its.