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How do you choose the batteries for the speaker?
It is best to select the batteries for your loudspeaker based on the model of the original battery. You should also pay attention to what kind of connectors are used in a particular case - there can be several series of the same model that have different connectors. When choosing a new battery, make sure that the new product has the same connector type as the original.
Can the battery capacity (mAh) be larger?
The higher battery capacity is not a problem. The more milliampere hours (mAh) a battery has, the longer a speaker will last.