And I want to use Kodama more and more as a laptop (which means: untethered to a power cord), so today I took the plunge and ordered a replacement battery. The 'normal' battery is only 4400 mAh, and the one I ordered is 10400 mAh! So that should mean a few more hours of using Kodama. I'm looking forward to that.
The only drawback is that the battery is much larger. But I can live with that.