Bluetooth digital speakers have built-in batteries, which makes them truly wireless. The quality of the built-in battery directly determines the playing time and service life of the Bluetooth digital speaker.
Battery type:
1) Polymer battery
Advantages: safe and efficient, no hidden danger of explosion in the soft pack.
Disadvantages: There are many types, pure cobalt (good) and pure manganese (poor) polymer batteries are several times the price difference.
2) 18650 battery
Advantages: excellent performance, charge and discharge can reach the highest level (used in laptop batteries), with explosion-proof protection
Disadvantages: There are many disassembly batteries and old batteries. Same 18650 battery good and bad price difference 5-10 times
3) Aluminum battery
Advantages: the price is very cheap
Disadvantages: poor performance. Without any explosion-proof measures, the consequences of an explosion are unimaginable.
Battery protection board:
1) The battery protection board of the miscellaneous battery is poor in charge and discharge protection, unstable and easy to damage the battery cell and electronic equipment.
2) The unstable current output not only affects the sound quality, but also causes a large current sound.
A good-quality battery can reach 80% of its initial capacity after being charged and discharged 500 times. Poor quality batteries do not even reach 50% of their initial capacity after 100 charge and discharge cycles.