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Old 05-19-2015, 01:53 PM   #1
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Charging a L-ion Phone Battery....?


Hey guys...

I had to get a new phone.... it came with just an AC charger and I am wondering if I can use my former car charger on it's battery also.

The battery in the phone has the following info: All DC of course.
Li-Ion 900 MAh
Nominal Voltage 3.7V
Limited Charge Voltage 4.2

The AC charger for this battery has an output of 5.0V and 700MA.

My old car charger has an output of 5.0V but only 550MA.

Does anyone understand battery charging...

and can I use, or will it hurt, the new battery to use the car charger which is 5.0V BUT only 550MA (as the AC charger that came with it can supply 700MA.)

Maybe it will just charge it slower, which is fine, but I don't want to use it if it will screw up the battery.

TIA

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Old 05-19-2015, 02:06 PM   #2
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Assuming they both have a mini USB plug, it will work fine. Most car chargers have a slower charge rate vs a AC charger.

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Old 05-19-2015, 02:11 PM   #3
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Quote:
Originally Posted by rjniles View Post
Assuming they both have a mini USB plug, it will work fine. Most car chargers have a slower charge rate vs a AC charger.

RJ... Thank ya..... Yes they both are mini-usbs.

Just curiosity, any difference if they were the RCA plugs. (You can tell I know NOTHING about electronics)
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Old 05-19-2015, 03:21 PM   #4
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RCA and other single pin plugs are dumb plugs. That's why you have to be so careful matching the adapter outputs.
USB (universal serial bus) plugs are smart plugs. They have industry standard protocols that can be used to control or limit the power supply.
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Old 05-19-2015, 03:23 PM   #5
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mini USB have a standard format and voltage that all manufacturers have agreed to. Older plug designs were specific to each maker; even if they were to fit the voltage may be wrong.
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