Why am I getting irregular voltages from the psp charging socket. and

The batteries of my psp 2000 and psp 1000 game consoles were dead. I used the original bms circuit of the batteries and assembled them on circuits with the same epproom, but it cannot charge the new 1500 mah 3.7 V batteries I installed and the orange light flashes slowly when I plug it in. However, the battery in the video has its own BMS circuit, I tried everything. I installed only Sony BMS and it did not work, I used two BMSs and it did not work, I used only the non-original BMS and it did not work. I would be glad if you could help, have a good day. (fuses are intact)