I have a home built battery, a Chinese 14S BMS and a Chinese 58.8V/7.5A charger. I recently had to resolder the charger connector wires because one of them detached. And then another.
Now I noticed that the charging seems to take unusually long time and checked (from BMS through Bluetooth) that the charging current is exactly 3.5A. I don't know if this is related to resoldering and I have no good idea what might be going on. Is the charger going bad?