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Looking at the power consumption of the various components in the Wiimote, the only thing that really eats a lot of energy is the radio. Data is not processed on the Wiimote. Looking at the data stream coming out, the only processed data is the camera at the front, which does it super-efficiently in an ASIC/DSP. Maybe a supercapacitor or normal battery in addition to one of those could store energy from the vigorous parts and allow for unbroken interaction. Games are already designed to pause on battery low, so it would not be critical, just annoying.

  * Loudspeaker
  * Vibration
Those 2 functions in the wiimote eat battery.

Sure, if they were in constant use, but they're used pretty sparingly. The bluetooth radio is on whenever the game hasn't been paused for a few minutes, and that dominates the power usage.

The Wii remote already has a 3300uF capacitor in it for that function http://en.wikipedia.org/wiki/Wii_Remote#Power_source

I know there's not serious data processing on the remote, but I count an analog to digital converter as processing.

The main reason why I don't think it would be suitable for a wii remote is that two AA batteries are supposed to last 45-60 hours depending on use. Remotes last much longer. Granted the wii remote is used more actively, I still think the non-reliability issue, even if only for pause, kills it as a power source.

In the end though, its probably the consumer's decision unless nintendo hard wires them in.

Data is not processed on the Wiimote.

The Audio comes in as ADPCM, which does need to be decompressed and then goes through a DAC plus presumably some kind of amplification. ADPCM is easy to decode, but does still need a processor of some kind.

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