Making a usb charger using a car charger

bumba27 said:

I have a sony car charger (AN400) it has a input 12v/24v = 700mA can any one explene me what dose it mean?

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another thing is I am looking for battery which can provide that input so that I can charge my moblie any suggestion ?

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bumba27 said:

I have 8 AA battery (2450mAh) I had connected using Battery holder.I want to charge 1800mAh mobile battery.can any one tell me how many time I can charge that

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bumba27 said:

I had added battery holder link please check that and tell me how many time.

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tpetar said:

Yes, this is battery holder which connect batteries in serie to achieve higher voltage around 10V if you using NiMh battery chemistry.

What is charger ouput voltage? Charger have USB female connector?


Best regards,
Peter

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bumba27 said:

chargerOUTPUT - 5.0V = 1200mA

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tpetar said:

That charger is dedicated to supply or charge USB adapted devices.

This charger cannot be used for charging your batteries in that battery holder, which requires higher voltage to charge batteries in serie.

You need adequate car battery charger for 8 NiMh cells.


Best regards,
Peter

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bumba27 said:

I am trying to charge my mobile using that charger and I am using those battery as an input of that charger See this https://www.youtube.com/watch?v=X6viXXww3Ng

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tpetar said:

That is completely different story.

You want to use 8 AA cells to charge mobile phone over car charger.

Yes that is possible. 8 AA Alkaline cells in serie can produce 12V which is enough for this adapter to operate. But in other hand there is question of amount of electrical energy what you will try to pump from one side to other side over charger. For sure you will not be able to fully charge phone battery with one new 8 AA Alkaline pack.


Best regards,
Peter

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Audioguru said:

Eight AA alkaline battery cells in series produce about 12.8V when new. The voltage quickly drops to 9.6V when they are used which might not be enough for the 12V to 5V adapter to work. Then the voltage slowly drops to 8V.

The adapter is used in a car. A car battery is DEAD when its voltage has dropped to 12.6V.
Maybe the adapter will work with ten AA alkaline battery cells in series.

An AA alkaline cell has a capacity of only 1000mAh when the current is approaching 500mA and when its voltage drops to 1.2V per cell. Then ten of them in series can charge your mobile phone only one time.

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bumba27 said:

Can u please tell me (2450mAh) 8AA rechargeable battery how much can charge it up. and how to calculate that.

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tpetar said:

Count that good AA Alkaline have capacity between 1500-2000mAh.


Best regards,
Peter

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bumba27 said:

Can u please tell me how u are calculating 8*2000 mAh or something else.

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