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            The 18650 lithium battery is a commonly used lithium battery in electronic products. It is often used in batteries of laptop computers and power banks. 18650, which refers to a battery with a diameter of 18mm and a length of 65mm.
This 3 x 18650 battery holder has inner connection in series.
 
                         
                    
 
            
                                                 
            
                                                 
            
                                                 
            
                                                 
            
                                                 
            
                                                 
            
                                                 
            
                                                 
            
                                                