So, the only question that remains is.....is this device safe and reliable? I don't want to melt my Droid =)
I would also like to hear other people's thoughts or experiences on this.
OldFart has already explained things pretty well, but to directly compare the two batteries on equal terms, convert each to watt-hours
1500mah x 3.7v = 5.55 watt-hours
4 x 2000mah x 1.2v = 9.6 watt-hours
I'd say you could likely get 2 full charges out of a set of Eneloops without an issue. I'm not sure at what voltage the Droid shuts off the device, but you may not fully empty the battery before it reaches the low-voltage threshold.
I'll just wait for Seidio's extended battery.
So, if somebody would be using 2 D-cell, 1.2 volt and 12,000 mAh like this battery Titanium D Size 12000mAh NiMH Rechargeable Battery Button Top
2 x 12,000 mAh x 1.2 volts = 57.6 watts/hour - in other words around 10 full charges for the droid?