A very interesting and useful design of a multiple nicd & nimh battery charger circuit which can charge many different NiCd and NiMH batteries.
.ti Universal Car Charger Design Requirements Additionally, to charge devices quickly, the car charger must support the data handshaking protocol required to support USB 2.0 BC1.2 and Divider Mode devices such as iPod® and iPhone® to allow charging currents as much as four times greater than USB 2.0 allows.
A good designed circuit of a Alkaline battery charger. The interesting thing of this circuit is that it uses a led that will show the charge of battery by blinking, when you connect a totally discharged battery the LED blink faster but when the battery charging process starts the LED blinking speed will dicrease slowly and completely stop when the battery will fully charged.
Here is a 12 volt lead acid automatic battery charger that shut off the charging process once the battery attains full charge. This prevents overcharging of the battery so that, the charger can be left unattended.