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What size is the battery? What type, Ni-MH or Ni-Cd? Do you want the power supply to disconnect by itself or do you want the battery to disconnect the power supply? Details man!
If it is a Ni-Cd or a Ni-MH battery, you could just use a MAX712 or MAX713 to charge the battery. They automatically stops charging when the battery is fully charged, and they're more than likely small enough to fit into your toy.
Bro,I want it for Ni-cd. I found a circuit for MAX712 to charge the battery. But 2 or 3 component values are not provided, probably it is depending on the battery voltage(which is for my application 7.5V, 9V, 12V). But i dont know how to calculate them. Can you please help me. Thank you.
Here's the link for the circuit:
**broken link removed**
It terminates charge, which in effect disconnects the charger. If you want actual disconnection you will need to sense charging current and operate a relay/contactor when termination is detected.The MAX712 terminates fast charge by detecting zero voltage slope, while the MAX713 uses a negative voltage-slope detection scheme.