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Is it possible to charge a cellphone using other cellphone?
I'm thinking connecting two cellphones and the other takes the charge of the other. Sharing battery life? opinions please
Not without removing the battery from one cell phone and making connections directly to the battery. There is not a external connection to the battery on any cell phone I have ever seen. The charging port on the cell phone is specifically designed so that there is no voltage on the charging pins with the charging cord unplugged.
Not without removing the battery from one cell phone and making connections directly to the battery. There is not a external connection to the battery on any cell phone I have ever seen. The charging port on the cell phone is specifically designed so that there is no voltage on the charging pins with the charging cord unplugged.
Good luck with that. Phones are to small these days. It would also never charge all the whay without a boost witch would drain the other battery fast.
Just not a good idea.
He asked if it would charge. It is extremely inefficient.
Source phone boosted 3.8v LiIon to 5v for USB OTG at about 80% switcher conversion efficiency. Destination phone linear regulates (usually) down to LiIon battery voltage (3.5v to 4.2 v), about 77% avg efficiency. Net battery to battery is therefore about 60%.
Just a matter of how desperate you need a charge. Also will be limited to 100 mA's or less charging current by source phone. If destination phone does not respect OTA protocol request/grant for current and tries to suck more then 100 mA's the source phone may immedately terminate its 5v sourcing.
If you continue to operate destination phone while attempting to charge at <100 mA you may likely be consuming more then putting in and continue sinking the destination phone's battery.
I welcome any kind of charging just about, as long as it works. In a storm when your phone doesnt work, you'll do just about anything to get a charge so it works
Of course i cant recommend this for everyday use, but for emergencies it can come in handy. Im working on ways to get mine charged in different manners too now since the 'big' storm Sandy hit the East Coast.
Good luck
Perhaps one of those cheap white light LED flashlights with the dynamo charger is for u. Hand powered. White LEDS usually have a 3.5V drop. That's enough to get a 3.6V Li ion going as it ranges from about 3V discharged to 4.2V @ 100%.
Perhaps one of those cheap white light LED flashlights with the dynamo charger is for u. Hand powered. White LEDS usually have a 3.5V drop. That's enough to get a 3.6V Li ion going as it ranges from about 3V discharged to 4.2V @ 100%.
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