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Theoretically... could we leverage some parallel interface for that? It should be feasible to clock it from GB clock and get all the data as needed. In fact we only need VSYNC, CLOCK, DATA0, DATA1... some 4 pin parallel interface anyone?

UPDATE
Ok, quick check tells me that there's DB25 printer port which is absent in pretty much all of the modern machines, but I'm sure we could emulate via USB.

Another thing is could we somehow leverage TCP/IP stack to handle large volumes of information? Does anybody know how Ethernet shiled works for instance. If packing data into TCP/IP frame is completely handled by the shield and is fast enough then we could think of feeding it parallel data somehow...

It was just random brainstorming...

Actually I've just noticed that 12ianma answered my question about parallel cells. I somehow missed it, so my bad, and thanks a lot for the help! However it doesn't change the point for stargazer's issue.

The voltage written on the battery will be the voltage of the battery independently on whether it has protective circuit or not. So if it's a 3.7V battery with a circuit it will say 3.7V. But you could measure it with the multimeter couldn't you?

Third pin however might or might not indicate the presence of protection. It might be just dummy pin which is quite typical for cheap aftermarket stuff. It could be simple temperature sensor, or smart full-featured protective board. So if you buy a battery from a good source and the battery has the spec - just check with it. Otherwise I don't see how to verify all that without dismantling the battery and even then you need to reverse engineer the board (if one is present) and figure what does it do. Does it protect from both overdischarging of overcharging? Or is it just for discharging. Do you see what I mean?

For example I've got hold of a DSi battery, but have no idea how many cells are there and whether a circuit is there or not. It has 3 pins all right, but it could be a dummy pin attached to ground or always returning OK status. So although I like the form-factor of this battery I won't be using it since I don't have the spec. If say it has more than 1 cell, then I need to take care of how they charge and discharge (balance them in other words) and the way they must be balanced depends on how many fucking cells are there

Anyways... this is the stuff I've read from various resources like battery university, but dunno how is it on practice. That's why I brought up this originally, but got no answer apart from accusation of asking pointless questions (it actually becomes quite typical for this forum which is a shame, I guess fantastic expert gurus sitting here won't descent to a noob like me).

What? It's exactly what I wrote, and that's why I'm asking about the number of cells... Anyways I'll figure on my own, thanks, this discussion becomes pretty pointless.

I grabbed one from ebay just to check its size and how it'd fit a pocket ( since 2A is quite an impressive capacity). Turns out this is smaller than anything on batteryspace with the same capacity and requires minor modification of battery compartment (as opposed to completely removing it and even relocating some of the caps). The only question is - how do we know is it a single Li-Ion cell or several cells connected in parallel? Thanks!

Ordered a couple of these LCDs let's see if they can be used with DMG. I really doubt though...
If you guys want to play with them as well here's the ebay lot http://www.ebay.com/itm/290925049233

Dude people made far more complicated mods than this so of course there is a way you can put your MGB in your DMG case, absolutely. You can totally do that. The problem is that it appears nobody has done this particular mod before so you are the first one to try. Do it and share with us and your name will be forever remembered for this mod. If you expect people will give you step-by-step tutorial - scarce the chance it will happen.

Let me sum up for you the contents of this thread:
1. Kitsch's breakout for DMG won't work. See uXe post about buttons. You might need to experiment with it there's nothing wrong in that. After all there's no easy way.
2. LSDJ often crashes on pocket so you could try plugging a LiPo cell instead of 2AAAs - DMG's battery compartment allows you to do that. Make the best out of it - find a cell with as much capacity as possible and don't forget protective circuit.
3. DO NOT use 9V battery. You'll burn the thing.

Aside from that:
- Link port, headphone jack, DC outlet and volume pot are different in DMG and MGB. So you might want to rewire  these parts from DMG to your MGB
- In fact you can't afford battery contacts on MGB PCB (it won't fit DMG shell) so your only option is some rechargeable solution
- I'm not sure MGB PCB is a good fit into the DMG shell, so you might need to trim out part of the battery compartment

EDIT
And don't forget about the cartridge slot! It's better to use DMG slot since it can be screwed to the shell. Thus you need to re-wire it as well.