Removing battery power will not reset the adaptation values. To reset adaptation values you need a fairly sophisticated scantool, one that can communicate with the transmission control module. Example, snap-on MT2500 with the S20 personality key, Snap on Modis or Snap-on Solus. Off-course the MB tools such as the HHT (Hand Held Tester) will do this as well, my experience is with the Snap-on tools.
Once tha daptation values are re-set, you need to follow a re-adaptation procedure. One of the menus on the Snap-on tool will show you all the readings you need to perform the procedure in one display window. The readings are :1-Engine Torque 2-Actual Gear 3-Desired Gear.
Below table shows the appropriate engine torque values for a '97 E420. Other models have different recommended torque values.

Upshift Frequency Torque in NM
1-2 4x 13-40
2-3 4x 25-50
3-4 3x 22-70
4-5 3x 0-110
Downshift
5-4 3x
4-3 3x

Do not exceed 1800rpm
Oil temperature '60C to 105C
AC Off
Idle for 10 minutes in P for storing