Li-ion battery
CN3065 Mini Solar Charger Module
The use of solar power in hobby electronics is highly understated. Its use is not widespread (outside dedicated projects) since it has a reputation of being too low-power to be useful.
TP5000 Switching Battery Charger
The TP5000 is a single-cell lithium battery charger.
R5449 Series: 1-Cell Li-ion Battery Protection IC with Built-in Driver for High-side Nch FETs and Temperature Protection
RICOH has announced a one-cell Li-ion / polymer battery protection IC R5449 series which can drive external high-side Nch MOSFETs and provides a high-accuracy detection at overcharge and overcurrent, and a high-accuracy charge inhibition for 0V battery.