Hearing aid system comprising a hearing aid and a charging station, and method for adjusting a signal processing parameter

A hearing aid system, comprising:

• a hearing aid having a rechargeable battery for supplying power and a first data memory for storing operating data;
• and
• a charging station having a nonvolatile second data memory, said charging station being configured to charge said battery of said hearing aid at least intermittently when said hearing aid is arranged in a charging position with respect to said charging station;
• said hearing aid being configured to transmit a first partial data set of first operating data stored in said first data memory to said charging station when said hearing aid is arranged in a transmission position with respect to said charging station during a first charging phase, and said charging station being configured to store the first operating data transmitted from said hearing aid in said second data memory;
• said charging station being configured to transmit a second partial data set of first operating data stored in said second data memory to said hearing aid when said hearing aid is arranged in the transmission position during a second charging phase;
• and
• said hearing aid including a computer unit configured to adjust at least one parameter relating to signal processing of said hearing aid on a basis of the second partial data set of first operating data transmitted during said second charging phase from said charging station to said hearing aid.