Question 2s bms Amazon

[Customledmods]

I have a quick question I bought one of these blue 2s protection boards Aideepen 5PCS 2S 10A 18650 BMS Lithium PCB Protection Boards 8.4V 7.4V 8.4V-9V PCM PCB Li-ion Lipo 2 Cell Pack with Balance Function Charger Protection Circuit Board
My lcd starts to flicker when I higher the volume my portable is drawing 2 amps and 2.25 amps with volume above 50% can anybody help

 

[Shank]

Doesn't appear to be a BMS, it looks like its just protection and balancing. Battery management would have a dedicate input for the charging, and output for power the batteries supplies. You will still need to use an external dedicated 2s lithium battery charger.


Hard to tell whats going on without more pictures or details. Could be a multitude of things, from a voltage drop caused by the board, a voltage drop from the batteries, or just a noisy signal from the board. Issues like these are why we recommend people avoid cheap boards like these for building portables.