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Q9: What battery is recommended for this ups UPS shield?
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If using a lithium battery, the required voltage is 3.7V;
If using a battery pack or battery holder, please make sure it is a parallel battery pack. '''Please use a high-quality battery holder with thick and durable connection cables. Using a low-quality battery holder with thin or poorly connected wires may cause the X1203 to malfunction or fail to operate as expected.'''