If you are having problems with your SIM928 you can call us at
If you wish to try and fix the problem yourself, the user manual may be useful, and the following troubleshooting guide may be helpful too.
1) Installing the replacement battery assembly (O928RBA) in the field
Click here to download the installation procedure.
You can order the replacement battery assembly by clicking here.
If you are still having trouble your SIM928, you will need to send the instrument(s) back to SRS for service. Click here to get an RMA number.