Here is a solar battery charger schematic which can charge 12 volt SLA batteries. This solar battery charger circuit has auto cut off function so it will automatically stop charging when the battery become full charge...
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.
This is a circuit of dc to dc converter, this is a versatile circuit and can be use for many purposes in this diagram LT1073 is used for 1.5 volt to 5 volt conversion, voltage can be taken from any size of 1.5 volt battery for example AA or AAA.
A useful circuit of a solar charger, the circuit charges AA or AAA type battries. The best charging power achieved by placing the circuit in direct sun light. This circuit can be also use for powering any equipment like radio, disk man or palm etc which uses AA or AAA type batteries.