how to charge it .v.1

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I was trying to program an AVR tiny to make a pwm based charger out of it ,

A charger which could be used for charging mobile batteries...

for this I experimented using the Nokia-1100 phone battery ..

When I checked the signal at the o/p of the charger ,it was a pure ,regulated DC power supply of ~5 V..

But when I tried to charge it(phone) using the DC power from a power supply at 5 Volts ,the charging never started .

The Nokia charger provides a current of 0.8 A for charging purposes ,and the power supply which I used is capable of much more ....

I was completely amazed to notice that the charging occurred from the DC supply from the ( nokia )charger ,but however if the same DC power when provided from an external source is unable to charge the hone battery ....

I have even known and seen devices called mobile USB chargers which sink in current from the USB port of a computer and these devices work fine...
then why does it not work from a power supply....

Somebody please help...
Any kind of help would be highly appreciated .

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Nokia phone battery is ..... Li-ion ?? Guess so huh ?

Have a quick look through this forum, and you'll find a thread about charging Li-ion's

Nard

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It could also be that the other adaptors are signaling the phone that it is plugged in. I had this problem with a device. I found that there was a pin on the connector that needed to be set to +3.8vdc in order to begin charging

Jim

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