Switched out battery and still not working

Switched out battery and still not working

This is for the V6 cordless slim. I got a new battery and it shows that it is charged, but it is not working. I took all the part off so it is just the charging dock and the motor/ board. It occasionally turns on for 2 seconds but 90% of the time it does nothing. Not sure what the problem is. I cleaned everything out that I could within the motherboard/ motor area.