Memory & Power - Alternatives

Hi Everyone,

I have a few questions relating to Memory & Power (Video 1.2b).

I wondered if there was any reason for using AA batteries as opposed to a LiPo?

I’d be interested to learn more about using ‘alternative’ energy sources to recharge batteries in-situ (Solar, Wind, Kinetic – Animal Movement, & more ‘exotic’ Hydrogen/ salt-water fuel cell system sources).  Has anybody had experience with any of these?

In smaller applications, something like these ‘Moovement’ GPS Ear Tags, they have a battery and integrated solar panels.  See:

As well as if anyone has had experience with Microbial Fuel Cells (MFC) on land or with gaining energy from sea-bed sediments in-situ?  For example, see; ‘Microbial Fuel Cell (MFC) as a Sustainable Land Monitoring Energy System’;

Many thanks