Does anyone know how to calibrate trip/range calculator 1998 chrysler sebring jxi, worked fine till i disconnected the battery

Am unsure from your description, whether there may be a component malfunction or not. Since the therm is accurate, am thinking compass needs recalibration. My 2000 jxi required it periodically when a strong magnetic field would influence the setting. The process was outlined in the manual and online. It involved driving to a large enough area where the driver drove the vehicle in a 50' circle at constant 5-10mph several times, staying away from large metal, magnetic or high voltage objects. A non congested area is preferable since it may take a few tries, and the process looks odd to a casual observer, lol. This is a copy of a web response I found, hope this helps: Compass Calibration The Automatic Compass Calibration feature eliminates the need for the operator intervention under normal conditions. If the CAL indicator is lit, the compass needs to be calibrated. A good calibration requires a level surface and an environment free of large metal objects such as large buildings, bridges, underground cables, railroad tracks, etc. Manual Compass Calibration Compass calibration can also be requested. To manually calibrate the compass, use the STEP button to step to the compass/ temperature display and then hold down both the STEP and US/M buttons simultaneously until the CAL symbol is displayed. Release the buttons once the CAL symbol appears. Manual compass calibration has been initiated at this point. Drive the vehicle in circles in an area free from large metal objects until the CAL symbol is extinguished. When the CAL indicator goes off, the compass is calibrated and should display correct headings. Verify proper calibration by checking North (N), South (S), East (E), and West (W). If the compass does not appear accurate, repeat the calibration procedure in another area. Compass Variance Variance is the difference between magnetic North and geographic North. For proper compass function, the correct variance zone must be set. Setting the Compass Variance Refer to the variance map for the correct compass variance zone. To check the variance zone, the ignition must be on and the compass / temperature displayed. Hold down both the US / M and STEP buttons simultaneously until the VAR symbol is lit and then immediately release both buttons. The current variance zone will now be displayed. To change the zone, press the STEP button until the correct zone is displayed. Wait for about 5 seconds. The trip computer will store this variance in memory and the compass will resume normal operation. The variance chart shows the distortion of true north, and the setting to compensate, depending on the primary vehicle location in north america, this will be in your manual. Best of luck to you.