I'd build a simple voltage divider charger with 1 Amp diode from 4.8 AC - DC adapter (500 ma - output volatge - 4.15Volt) to charge my two AA battery.

My Battery finished charged was 1.25 (Sony 4600mAh), but it can only be used within half day.

I suspect It may not enough to charge in capactity charged.

Does it required to add low capacitance of Capacitor + 1 Amp diode for quickly release current into my battery for charge?

Thanks appropriate to all helps.

 

Welcome to AAC.

It is very hard to follow your post. I assume that English is not your first language, are you using a translator (like Google Translate)? If not, you might try that so you can write your post in your mother tongue with your entire vocabulary. The translation might be better.

In any case, trying to decode your post, I have the idea you are saying that you charge the two cells to 1.25V each (I assume these are NiMH), and then they self-discharge within a days.

If that‘s the case, then no, it can’t be the charger. If the cell is at 1.25V then it is at least partially charged. It may not have the full capacity if you try to discharge it through a load but concerning self-discharge, the state of the charge won’t effect it.

It sounds like defective cells, are they old?

 

Welcome to AAC.

I'd build a simple voltage divider charger with 1 Amp diode from 4.8 AC - DC adapter (500 ma - output volatge - 4.15Volt)

Generally, a voltage divider is not the best option for a charger. Post a schematic of your charger, showing how/where the components are connected. Also, post links to the adapter and battery adverts, or pictures of their labels. Be aware that there are counterfeit Sony batteries being sold. Did you buy yours from a reputable source? If a fully charged cell self-discharges in half a day it is a fake or defective.

 

A charger is not as simple as that, depending on the battery type and there are many types of batteries. Generally they are constant current and your voltage devider is not.
You need to know the basics of reghargable batties and their charging methods or you will run the danger of your battery exploding or catching fire. You should not be doing this if you are not sure of what you are doing.

 

Sony or any other manufacturer does not make an AA 4600mAh Ni-MH battery. They are all 2500mAh so you got fakes.
A dead battery cell is 1.25V and it begins to charge at 1.3V and is fully charged at 1.4V to 1.5V.
You need a proper charger to charge them, not a voltage divider.

 

Sony or any other manufacturer does not make an AA 4600mAh Ni-MH battery. They are all 2500mAh so you got fakes.
A dead battery cell is 1.25V and it begins to charge at 1.3V and is fully charged at 1.4V to 1.5V.
You need a proper charger to charge them, not a voltage divider.

yes, the battery is 1.3 under fully of charged. Maybe I'll take down the voltage divider and build a low capacitance of capacitor with 1 A diode in series and I should head to back to check the amperage of DC current before build up.