Need help doing that.

Wendy

Joined Mar 24, 2008
22,141
Most phones have regulators built in.

You do not need to max out specs given for the battery. Use the specs listed on the phone.
 

Wendy

Joined Mar 24, 2008
22,141
Something else that occurs, pinouts on MOSFETs are not standardized. Do you have a datasheet on the MOSFET?
 

tom66

Joined May 9, 2009
2,595
The charger specs of outputs are. 5.0vdc / 350 mah as said. but the cellphone's batetry specs are 860maH/3.7V/3.2W. EH????
There is a circuit inside the phone to drop 5V to the 3.7V - 4.2V required to charge the battery (a lithium polymer battery, usually.)

If the battery is 3.2Wh, it will take about 1 hour 49 minutes to charge the battery assuming 100% efficiency. A more practical efficiency to assume is 80% for a mobile phone, which means charging will take around 2 hours 17 minutes.
 
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