Buy a new battery. I bought UP503759-NR70, you can find it here: http://www.amazon.de/Qualit%C3%A4tsa...0250201&sr=8-9
(once again, thanks rvs)
The battery you buy should be of Lithium-ion polymer type and its size should not exceed 37mm x 5mm x 65mm.
Gather the tools. You'll need:
1. 3.5mm flathead screwdriver
2. T6 torx screwdriver
3. A soldering iron, a bit of flux and solder.
4. An insulating tape
Open your DR1000
Put your DR1000 face-down on your table and insert the flathead screwdriver into the gap, as shown on the picture below:
Then screw it a bit until you hear a "click":
Do the same with all remaining "corner pieces":
Now its time to open the back cover. First, remove the rubber foot in the centre of the back cover:
Then unscrew the torx screw hidden in the hole.
Next, insert the flathead screwdriver into the holes shown on the picture:
And gently pull the screwdriver back until you hear a click. There are 3 slots under each of removed "corner pieces". Move from outside to insidde (from the corners to the side capacitive buttons), that means first unlock the top left lock, next second from the top and so on.
Finally, use the screwdriver to spread the gaps on the top and the bottom of your DR:
And voila! Your DR1000 has been opened:
Change the battery.
The battery is the thing:
Remove it. Unstick the tape then unplug the battery (gently move the cables up and down while pulling them):
Remove the plug from the new
battery. There are small plastic locks on the plug. You should lift them up with the screwdriver, as it is shown on the picture:
And cut off the plug from the old
one, leaving 3-4 cm of the cable:
Solder it together:
Next, plug the new battery:
And stick it with insulating tape so the inslulation tape on the cables can't move:
A few seconds after you plug in your new battery, you'll hear a "beep". It's your DR booting up.
Close your DR1000
Put the back cover on the right place and press it to lock all the locks:
Screw the torx screw in the centre and cover the hole with the rubber foot.
Put the corner parts on their places and slide them to the centre:
Enjoy your DR1000 for the whole next year.