How to integrate a rechargeable battery to a circuit?

[vekx]

I have been making 9v battery circuits for amplifiers, but the one I wish to make will live inside a sealed enclosure, therefore if the battery runs out it cant be replaced. I need to make the battery a rechargeable one and build on an extra bit to the circuit to make it work, and also have another input to charge the battery.
Below I Linked the picture of the standard circuit I have been making, what do I need to add and how to create the scenario above?

**broken link removed**

 

[blueroomelectronics]

A 1/2W amp will drain a 9V battery in no time, the source notes recommend a 9V wall adapter. Plus NiMH 9V batterys as any battery will stop holding a charge as they get older.

 

[vekx]

That is true, however I have used batteries and under casual use, they seem to last great. Plus if it were rechargeable, it should last a couple years at least, and its very in-expensive, so I don't mind it dying eventually. If you could help me figure out how to make it work it would be great.
Thank you

 

[audioguru]

New technology rechargeable Ni-MH AA cells hold their charge for months, not a year. But 9V rechargeable Ni-MH batteries are still made with old technology and hold their charge for no more than 1 month. They are 7.2V or 8.4V, not 9.0V.

 

[ronv]

There are lots of them on the net. You just need to make a connector to hook the battery to the charger.