Is it possible if battery is removed and one want to operate with charger, It should not work .The guess is there a high peak currents to support and there's no room for a big capacitor. Capacitors typically are a large component.
The cell can easily determine if the battery is present by looking at the temperature monitor which is typically a thermister. In my phone, the two outer pins are the battery and between - and one of the middle pins there is about 10K. Total of 4 contacts.
Some packs for the same phone have the polarity marked on them. Some do not.
MY GUESS is replacing the battery with a supercapcitor e.g. http://www.mouser.com/ds/2/87/Bus_Elx_DS_4393_PB_Series-479424.pdf and a resistor for the thermister might work.
I doubt you would have to add a supercap charger. e.g. http://www.linear.com/product/LTC4425
If your battery pack has three terminals it could have one of these ICs https://www.maximintegrated.com/en/products/power/battery-management/DS2703.html in them or something similar. Apple uses the 1-wire serial number IC for their magsaf batteries, but it contains a lot more info.
A traditional power supply. Maybe not. A 4-quadrant power supply possibly. They are able to source and sink current. I would at least put a diode or ideal diode controller in series with a conventional power supply for protection. Some bozo plugs in the USB charger.Your right. Then the solution is a power supply connected to phone battery terminals.
I have never owned a cell phone. I probably shouldn't comment.
The peak current draw might be an important issue.If the battery pack has some sort of battery IC in it, your really going to have trouble.
IF it consists of a thermister (10K is typical) and power pins, then replacing the battery with a supercap AND emulating the thermister MIGHT work.
I don't think so. My cell phone can run on the battery, and charge from the charger at the same time. So if you're thinking the battery is capable of delivering sufficient charge to run the phone but the charger can not - then how can the charger charge the battery while the phone is in operation? So I have to disagree with the statement "your charger can not supply the needed current".Because of the current capacity. Your charger can not supply the needed current.
If you replace charger with a power supply, it still may not work. It will depend on the internal circuitry.
The internal charge circuits might not pass the required current.
Mine will too. It's just won't keep up if continually transmitting in tethering mode and the battery needs "some charge" before it will even turn on.I don't think so. My cell phone can run on the battery, and charge from the charger at the same time.
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by Jake Hertz