I need to replace battery. Is it easy to get back off? Manual says I need to take it to repair shop

That will be in the setup menu.

Refer to this manual it has all the info you need. Click on the the link below to download
http://www.mio-tech.be/Manuals/269+/Device-Manual/268-plus-269-plus-Device-Manual-EN.pdf

Mio p350
http://www.giantsacademy.com.au/layouts/mio-p350-usb-driver.php

Automatically get recommended drivers and updates for your hardware
http://windows.microsoft.com/en-us/windows7/automatically-get-recommended-drivers-and-updates-for-your-hardware

Go onto the Mio.com website and contact section under support. Send a message with the serial number requesting the key.

Yes, you definetely need battery replacement.
As the hart rate monitoring is most sophisticated part of the device, it has more IC (Integrated Circuits) than any other features.
More IC's means more power is needed, so, if the heart rate monitor is starting to malfunction, that's the very first sign of underpowered battery.
Find your nearest watch repair shop and ask for battery replacement.

Do not forget to rate, please.

You will have to do a "Factory Reset".

***You Will Lost All Your Data***

While you reset the device by pressing the little button on the bottom with the stylus,
Hold "UP" on the direction pad.
Keep holding for about 30 seconds.
You should then be prompted to do restore it to factory settings.

Let me know if this doesn't work, and we'll go from there,
Simon


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Mio P350/550 Hard Reset 1. Turn off the pocket pc (on/off button ).
2. Push the joystick button up (to the screen).
3. Turn on the pocket pc.
4. keep holding on the joystick button for 30 second.

What navigation software you use? All navigation software need to install correct Port and Baud Rate for work - please check it in you software.

If you need help or professional GPS-consultation or unlock you PNA, update navigation maps - please ask
http://www.goodslowprice.com/en/unlock.htm

Hi, to replace battery, you need to undo the 4 screws hold the back casing. When these are removed you can open the back, revealing the battery. There is a black plug that pushes into a white socket on the pcb, with 4 wires coming out of it that goes to the battery. Pull this plug out and the battery then comes free. Hope this helps.