1. Power off the device and disconnect any cables.
2. Locate the battery release latch on the bottom of the device.
3. Slide the battery release latch to the unlock position.
4. Remove the old battery from the device.
5. Insert the new battery into the device, making sure that the terminals are aligned correctly.
6. Slide the battery release latch to the lock position.
7. Reconnect any cables and power on the device.
Here are some additional tips for changing the battery on a 300M:
* Make sure that you have the correct size battery for your device. The battery size is typically printed on the battery itself.
* Be careful not to damage the battery terminals when inserting or removing the battery.
* If you are not comfortable changing the battery yourself, you can take your device to a qualified technician.
