I know, from a little experience with LED flashlights, that it can be very dangerous (potentially explosive!) to use Lithium cells in series (unless there is a protection circuit, as iBasso assured me is the case with the battery for the DX100), but any such concerns would not would not apply in the case of commercially-produced aftermarket high capacity batteries within the context of consumer electronics, since the voltage generally remains the same, and only the capacity increases; the idea being to simply swap out the standard battery pack with an electrically-equivalent, but higher-capacity, battery pack.
I wouldn't know if this capacity increase is accomplished by wiring 2 or more discrete packs in parallel, to make a larger capacity pack, or if these higher capacity packs are simply manufactured as a single (larger) cell.
However, the reason I mention the above is because I wonder if, in the scenario of a pack perhaps comprising 2 discrete cells wired in parallel, this might yield lower overall internal resistance, and thus, perhaps higher performance for our purposes.
SO.... the natural logical conclusion of this would be to experiment with trying various capacity sizes of compatible cells for the DX90. Anker certainly offer a variety of different capacities.
I don't own a DX90 yet, but would anyone be up for buying-&-trying 2 or 3 different capacities all from the same vendor?
Edited by Mython - 4/26/14 at 11:56am