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Dual USB Recharging Faster?


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#1 jimlau

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Posted 23 March 2018 - 11:41 AM

I have 2 camera batteries (1100mAh) that charge via USB to my PC. Is charging them both via the same USB cable any faster than doing them 1 at a time?



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#2 mightywiz

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Posted 23 March 2018 - 12:18 PM

it would actually be slower doing them at the same time.   your device can only output a certain amount of current.  your batteries would split that current in half to charge both at the same time causing the charging time to be longer.



#3 jimlau

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Posted 23 March 2018 - 12:21 PM

thanks.



#4 mjd420nova

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Posted 23 March 2018 - 06:48 PM

Actually it would be better to buy an AC adapter (the kind with a USB port) to charge each individually.  Those USB ports on PCs and laptops are not made for charging anything.  I know it is handy  but it has a limited current and is prone to overheating and failing.  Don't destroy the port for further use as it would require that the main board be replaced.  I advise all my clients to not use the USB ports to supply power for any device.



#5 jimlau

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Posted 23 March 2018 - 07:03 PM

Actually it would be better to buy an AC adapter (the kind with a USB port) to charge each individually.  Those USB ports on PCs and laptops are not made for charging anything.  I know it is handy  but it has a limited current and is prone to overheating and failing.  Don't destroy the port for further use as it would require that the main board be replaced.  I advise all my clients to not use the USB ports to supply power for any device.

Out of curiosity, is it any faster using an AC adapter plugged into the wall than via the PC?



#6 Platypus

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Posted 23 March 2018 - 07:36 PM

is it any faster using an AC adapter plugged into the wall than via the PC?


Normally, yes. A USB2 port can supply 0.5A of current, a USB3 port 0.9A ( but a port designated as a downstream charging port can supply 1.5A). A mains charger will typically be able to supply more, for example I use one that can supply 7A total to 4 outlets, one with a maximum of 2.4 Amp output. Unless the battery only needs and draws 500mA on charge, the AC adapter will charge the battery or batteries faster.

Edited by Platypus, 23 March 2018 - 07:41 PM.

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