You need to carefully disassemble the battery and measure the voltage between the positive and negative terminals.
Confirm what type of battery it is.
If it is a lithium battery, measure the voltage of each cell, and remember not to disconnect them.A closer look reveals that the battery pack consists of several cells connected in parallel, and then several cells connected in series.
If you can see the control chip, that would be even better. Remember, never disconnect the battery power; if the BMS loses data, it will be irrecoverable.
If you're unsure, take a photo and upload it.Only then can everyone better assist you.
