5 volts with reghargable batteries

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ktec1

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hi
i want to have dc 4.8 volts by connecting 4 batteries(1200mah 1.2 volt)
which batteries are better, i also want to have schematics of circuits
to be able to charge that batteries(not to be complicated chargers)
can anyone help me on this?
thanks
 

You may consider 1200mAh NiMH [nickel-metal hydride] batteries ..

Here is an example of a simple charger (for 4 cells connected in series) \:
**broken link removed**
BC557 is not suitable for currents above 100mA; I would replace it with BC327, BC807 or BD136 ..

Just be aware that fully charged 1.2V NiMH battery will have a voltage of ≈1.4V, so 4 of them ≈5.6V ..

Regards,
IanP
 

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    ktec1

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dear ianp
thanks
another question does fully charged NIMH loses its any qulity or life
but the my main question whwre can i find an exact curve
representing the output voltage of the battery according to its life or its left mah
of energy
thenks again
 

Search for manufacturer data sheets, e.g. from
 

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    ktec1

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