There are 3 types of built-in battery of bluetooth speaker.The recommended is lithium polymer battery without danger of explosion，good performance and environmental protection by Jumon of bluetooth speaker,party bluetooth speakers and disco party speakers.

1.Lithium polymer battery                                          

Advantages: safety,no explosion danger，environmental protection，good performance

Disadvantages: wide varieties, The price difference between pure cobalt(better)and pure manganese polymer(poor) battery is several times.

2.18650 battery

Advantages: excellent performance, charge and discharge can reach the upper level (more for notebook batteries), explosion protection

Disadvantages: more disassemble and old batteries. The price difference between 18650 battery(better) and 18650 battery(poor) is several times.

3.Aluminum shell battery

Advantage: Cheap

Disadvantages: Poor performance,no explosion protection measures.