Would like some thoughts on the following:
I would like to build a small - somewhat self-sustaining bot by using rechargeable batteries that are trickle charged using a BEAM ciruit from a solar cell. My question is on battery types. I have some very small 3vt, 45mah rechargeable lithium coin cells (ML2020)that I could put in series for 6vt - is 45 mah too low to drive the board some planetary geared pager motors and some sensors? My other option is a small NiCd 4.8 vt/280 mAh battery pack. I am looking for small the smallest solution I can find. Any thoughts are appreciated. I have used LiPo batteries in the past, but you cannot trickle charge them with a solar circuit as far as I know.