Build a Simple 5 volt Charger

[koklimabc]

Dear Sir,

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.

 

[Avo Mk8]

A dc adapter designed to provide a fixed voltage is not suitable as a battery charger without additional current management.

Differences between a Power Supply and a Charger

Haredata Electronics is the leading UK Provider for AC/DC industrial and Medical Switch Mode Power Supplies, USB Power, Battery Chargers, Battery Packs, Industrial Components and Full Electronic Powertrain Vehicle Technology We offer Industrial and Medical Grade Power Solutions available...

www.haredataelectronics.co.uk

Ideally you need a multimeter to measure what's happening.
If your adapter was a proper 500mA charger, it would take (very approximately) 10 hours to fully charge discharged batteries.

I suspect your dc adapter may be folding back output voltage, maybe to near zero, because it is seeing a load of greater than 500mA. Without a meter it's difficult to know!

 

[koklimabc]

A dc adapter designed to provide a fixed voltage is not suitable as a battery charger without additional current management.

Differences between a Power Supply and a Charger

Haredata Electronics is the leading UK Provider for AC/DC industrial and Medical Switch Mode Power Supplies, USB Power, Battery Chargers, Battery Packs, Industrial Components and Full Electronic Powertrain Vehicle Technology We offer Industrial and Medical Grade Power Solutions available...

www.haredataelectronics.co.uk

Ideally you need a multimeter to measure what's happening.
If your adapter was a proper 500mA charger, it would take (very approximately) 10 hours to fully charge discharged batteries.

I suspect your dc adapter may be folding back output voltage, maybe to near zero, because it is seeing a load of greater than 500mA. Without a meter it's difficult to know!

ok noted.

 

[mainline]

Depending on the type of battery ?

You may need constant current, not constant voltage.
There are plenty of simple devices/circuits on the internet.

 

[koklimabc]

Depending on the type of battery ?

You may need constant current, not constant voltage.
There are plenty of simple devices/circuits on the internet.

Yup, you are right.