I've a stripped 7C G2 with a dead mainboard.  I have not been able to source a replacement, so I'm in the process of breaking for spares.  I have a buyer for the screen.  I'm happy to sell the battery for a small fee, if you are happy to go with a used one.  I'm not looking to make money, just hassle costs really.  Are you able to fit it yourself?  It's tricky in that the battery is taped to the screen ribbon cable, and inevitably removing the battery pulls the ribbon cable out.  Not too tricky if you are OK with a screwdriver.  For me the hardest bit was removing the back!  Once inside, not too bad.

I'm keen not to be seen using this as a trading area, so I'll PM you and we can agree something.  Regarding disassembly - remove 2 screws from the base adjacent to the USB socket.  The device splits in half - the rear panel slides up - imagine you have one hand flat on the screen, and the other hand flat on the back, and you apply pressure and slide the back panel upwards away from the USB port.  It is difficult to slide in the first instance, and requires patience and application of pressure more in the centre of the back panel. You'll find your own way but essentially you are looking to slide the back panel not more than about 2.5mm, then lit will be ready to lift off.  This is actually the hardest bit.  Once done, you'll see the battery but it'll not just lift out.  Rather, you need to remove the ring of screws around the edge of the secondary internal cover (about 10 screws?) and prise it away.  The issue is that the battery is stuck to the back of the screen with double sided tape, and the tape runs across the ribbon cable that links the screen to the mainboard.  Unplug the battery via the white plug with the 3 wires.  When you try to lift the battery, it may drag the ribbon cable out of its socket.  So you need to lift the battery firmly so as to prise away from the tape, but very carefully, keeping a finger on the ribbon cable to try to keep it from lifting upwards.  You'll not know if you have been successful until you put the battery back in and see if the screen works.  My approach is to remove the sticky tape (using isporopyl alcohol from Maplin) from the area where it lays onto the ribbon then it is much easier next time around.  If you are unlucky and the screen ribbon is dislodged then you have a bit more work to do!  But that's perhaps for another post - it is slightly trickier in that there is a risk of breaking one of the tiny plates that hold another ribbon cable in place.  It's all quite doable with a bit of patience.