T20MT battery Need to open the case (T20MT) for battery replacement. Does anyone know how to open the case?

if the supplied owners manual does not specify how to replace the battery, contact Yamaha. worst case you'll have to purchase another remote, sorry!

Check this out, not the right year but i doubt that the procedure isn't very different.
How To Replace Jeep Grand Cherokee Key Fob Battery 2014 2015

The T20 has a 'built in' battery like most modern mobile phones have. Changing the battery isn't easy, it involves taking the player apart to access the battery. It may be easier to replace the whole MP3 for a new one.

If anyone opted out to replace battery in their own watch and do not know what type and size of battery is correct for replacement, just open your watch case back and reed and memorize all the writings on battery your watch allready has in it. All you can do now is to buy exactly the same replacement battery and you will never get it wrong. All that matters is the combination of letters and numbers on battery. Make is not important, so, it can be made by Casio, Maxell, Citizen, Ronda - you name it. Just make sure you are not buying some of those cheap, unknown maker batteries, as they usualy lasts for about few weeks and then they are gone. Choose well known makers name and the battery will power your watch for 2-7 years, depending on each particular watch movement model. In case if you lost your original watch battery, check your watch instruction manual. If you lost both - battery and manual - then there is no other way, but to visit your nearest watch repair shop and ask for help. In your particular case I do not see the reason why you should find the battery, because any decent watchmaker has many different batteries in stock. All you have to do is to find your closest watch repair shop and ask watchmaker to replace the battery. No need at all to send it to Luminox, as this job can be done at any watch workshop with the same precision and quality. In addition you will save money for shipping and pay less for battery itself.
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I need to know how to replace the batteries, but I don't plan on spending money to find out, I didn't realize your site charged for the answers when I gave you my EMail. I can probably just open up the case and figure it out myself, I just wondered if anyone else hade done it and had any tips.

I have not figured out how to open the casing lid to replace the battery, but the number for the battery you need should be engraved on the lid. Double check your own lid, but mine says that the battery is an SR621SW. I'm sure there are different brands that would match this number.

Use paperclip to push in pin size hole below keyboard and then slide panel to right. Battery box is right there. Replace batteries and then was already to accept code.

This shaver was pretty clearly not designed for battery replacement. To open, first remove the screen and blades, and unhook the metal collar from the tab on the back of the case. Then carefully pry off the black inset on the front of the shaver. Underneath it, near the bottom are two screws. Remove these. The case is now only held together by several plastic latches, which can be carefully pried apart with a small screwdriver. The two 2/3A size batteries are soldered to the printed circuit board, which can be pulled out (don't break the wires to the motor) by a little wiggling. The original batteries in mine are 1100mAh, and I have just ordered 1600mAh replacements. The new ones don't have tabs - so soldering them in place is probably going to be a challenge.

Good luck.

well there is no easy way. You will have to open the machine up when you have ordered the parts you needed. Not to hard but make sure you keep you eye on the sequence how you pull it apart.

The key to opening the M5160T is to slide the power button cover strip: http://www.ari-service.com/blender/data/28147/3756_001.pdf