I am trying to make a charger for my 9 volt rechargeable Battery.

I was wondering if the attached circuit is suitable.

 

Hello,

No, there is no current limitation.
Without any current limitation you could overheat the battery.

Bertus

 

Hello,

Have a look at the following PDF on how to charge a NiCad or NiMH battery:
http://educypedia.karadimov.info/library/f7.pdf

Bertus

 

Thank you for all the advice and assistance

Best wishes

Rodney

 

Hi Rodney,

You would need a constant current source for charging at 10% of AH rating which, in this case, is 25mA. Charging a fully discharged battery would take 10 hours.

Here's a circuit using a wall wart and a 3 Terminal Regulator LM317T.

The value of R would be 1.25/0.025 = 50 Ω .

This charger can even charge a 2500mAH battery by changing the value of R to 5 Ω.

Regards,

Nandu.

9V battery is usually made of 7 cells and it's voltage after full charge can be ~ 10.5V.
12V supply voltage is probably too low because LM317 needs even with small currents at least 1.5V differential between in and out terminals + 1.25V over the current limiting resistor.
15V supply should be enough.
It is recommend to charge the battery 12h at 10% current, because the charging efficiency is not 100%.

 

This is a great circuit thanks for sharing.