FP3 won't charge anymore.

My FP3 won't charge anymore. Whenever I connect a charger it charges incredibly slowly and keeps disconnecting. I thought I can just change the bottom module so I have a new USB port and can charge it that way. But the bottom module is not available anywhere. On the fairphone side you can click on buy now but nothing happens. Repairability is great but useless when you can't buy spare parts anywhere.

PS: Is there a way to fully load the phone at least once so I can migrate data to another phone properly without it dying of low battery?