First of all, open the case carefully.
And then you see there are two Lithium cells inside, lift them up:
Take them out with the circuit board. This is supposed to be the protection circuit, we're going to keep them both as the interface to the camera, and also to serve as the protection circuit of the external battery. I will use two unprotected 18650.
Put the battery case inside, insert it into the camera, mark where you should drill a hole for the external battery.
Now, you're ready to do the soldering work.
Solder the case, mark the polarity.
I put some hot melt glue for insulation and for fixing the cable in place... you may want to fill more just to glue up the cover.
QED.
I think it is good for astrophotography. You don't want to remove the camera just to replace the battery, one could do it externally without touching the camera body.
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