Okay, I am sorry to hear that. I am thinking that this is a firmware issue rather than battery related because of this occuring on all of your handsets. It could possibly be the main base as well. The main base could be causing the handsets to shut off. Lets try updating the handsets next with the Gigaset QuickSync program using your PC.
To enable your handset to communicate with the PC, the Gigaset QuickSync program must be installed on your PC (free to download at gigaset.com/hq/en/cms/PageQuickSync.html).
The firmware-update of handsets is only supported by Gigaset QuickSync for Windows. The Gigaset QuickSync for MacOS supports only the firmware-update of the SL910H.
Please make sure that you use the USB cable to connect the handset that you want to update, as updating via Bluetooth is not supported!
If your handset is updatable and your PC is connected to the Internet, Gigaset QuickSync will automatically check for new firmware at least once a day, and if it is available it will prompt you to update your handset. You may disable this feature by unchecking the “Check Internet for new firmware and notify if update is available." checkbutton on the Settings - Firmware... page. It can also be disabled via the appropriate checkbox when Gigaset QuickSync prompts you to update your handset.
You can always trigger the facility to check the Internet for new firmware manually:
- Connect your phone to your PC using a USB data cable.
- Start the Gigaset QuickSync program on your PC.
- Establish a connection to your handset.
- Click in the main menu of QuickSync on Firmware update.
This launches the firmware update. The update process can take up to 10 minutes (not including the download time). Do not interrupt the process or remove the USB data cable. The data is initially loaded from the update server on the Internet. The amount of time this takes is dependent on the speed of your Internet connection.
The display on your phone is switched off and the message key and the talk key start flashing. Once the update is complete, your phone will automatically restart.