Based on a 555, this 80's American documentation circuit detects the voltage of a battery and can then disconnect the charger. The transistor may be a general purpose type.
This circuit is from an operating manual from the 1990s. The circuit generates sinusoidal and cosine...
The circuit shown is from the 1993 Motorola Linear Interface ICs. The power source may be common...
This circuit works with only 1.5 V and can be powered by a solar panel. The circuit is from 1991....