I've just picked up the Griffin PowerJolt Micro which is incredibly small. It's rated at 5V @ 2.1amps but I'm worried that the amperage is too hot. Can anyone technical comment on whether this will fry the battery or more importantly, the charging circuit?
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This might be a stupid question
I have a Nokia wall charger with microUSB, it outputs 5V 1200mA
The charger that came with the Desire outputs 5V 1A
It's almost the same, 200mA difference, can I use the Nokia charger without damaging the Desire?
Thanks!
I would. I'd only worry if the device required a voltage or ampage rating higher than the charger could provide. A device won't draw more wattage (current x voltage) than it actually needs (or we'd get through a lot of fuses). of course, you might blow up your entire street, in which case I take no responsibility.
when charging any kind of battery what you are actually doing is putting a dead short across the battery. a charging battery does not "draw" current. as it happens you can put huge current across a LiPo battery without doing any damage. it is no problem to use your charger. it will charge the battery 20% quicker.
Sent from my HTC Desire using the XDA mobile application powered by Tapatalk
Thans for the replies!
I've just picked up the Griffin PowerJolt Micro here which is incredibly small. It's rated at 5V @ 2.1amps but I'm worried that the amperage is too hot. Can anyone technical comment on whether this will fry the battery or more importantly, the charging circuit?
Why did you post two thread. You can delete one, please.
http://forum.xda-developers.com/showthread.php?t=1145650
http://www.expansys-usa.com/fastmac-u-socket-dual-socket-usb-outlet-white-229425/
According to specs it outputs 2.4A which is well above 0.7A which Samsung provided DC adapter outputs. Will this charge faster? Will it damage Galaxy S3 or decrease battery life? Any experts on this issue?
To the best of my knowledge any remotely "smart" device will only draw what it needs, which is why a 40w lightbulb doesn't explode when you plug it into the same mains outlet that can power a giant dyson motor... so unless something's particularly out of spec you should be fine.
Hi,
I have an HTC phone with its AC Adapter rated at 5VDC - 1A. I also have an old Motorola dumbphone adapter rated at 5VDC- 850mA. The thing is, I realized that the connectors resembled each other and when I tried to plug the Moto into my HTC I found that it was a perfect fit.
I'm wondering if anyone knows if the difference in currents can damage the battery on long-term charges, or if it will just take more time to charge? I verified and they are both 5-pins and I tried plugging into the wall for a second and my phone indicated that it was charging.
What's the opinion of more knowledgeable people here?
Thanks!
You're fine, it will just charge slower.
Ordered a QI charger off Amazon (the same Lerway Chinese brand one everyone seems to get) and it's charging incredibly slow. Not sure if the app I'm using to record the charge rate is incorrect or I'm not reading it correctly but it says it's charging at only +200mA max sometimes as slow as <50mA.
Anyone else experience this?
skusa93 said:
Ordered a QI charger off Amazon (the same Lerway Chinese brand one everyone seems to get) and it's charging incredibly slow. Not sure if the app I'm using to record the charge rate is incorrect or I'm not reading it correctly but it says it's charging at only +200mA max sometimes as slow as <50mA.
Anyone else experience this?
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Click to collapse
What kind of power source you use to power the charger and what kind of cable do you use?
If you connect the charger to computer USB port it will not provide enough power for the charger. Same with cheap cables, like the ones mostly included with the generic QI chargers. You need a premium USB cable.
Also if you have a thick case on your phone it will diminish the charging current received by a coil in your phone.
Firstly check how much power and what current your charger gets, so instead of plugging the QI charger, plug your phone and check what amperage you get (I use Current Widget). If it's less then 1600mA (maximum amperage that N5 will allow from direct charging through cable) your charger is underpowered and you need to change socket charger to 2A one. If you're using 2A socket charger and still get under 1600mA then your micro USB cable isn't good enough.
Properly and fully powered Qi charger should charge your bare phone (without a case) at about 700-800mA.
Znamir81 said:
What kind of power source you use to power the charger and what kind of cable do you use?
If you connect the charger to computer USB port it will not provide enough power for the charger. Same with cheap cables, like the ones mostly included with the generic QI chargers. You need a premium USB cable.
Also if you have a thick case on your phone it will diminish the charging current received by a coil in your phone.
Firstly check how much power and what current your charger gets, so instead of plugging the QI charger, plug your phone and check what amperage you get (I use Current Widget). If it's less then 1600mA (maximum amperage that N5 will allow from direct charging through cable) your charger is underpowered and you need to change socket charger to 2A one. If you're using 2A socket charger and still get under 1600mA then your micro USB cable isn't good enough.
Properly and fully powered Qi charger should charge your bare phone (without a case) at about 700-800mA.
Click to expand...
Click to collapse
Thanks for the info I thought I was going crazy.
No case so that isn't an issue.
I have the phone connected direct to a 3A charger currently and am only getting 995mA charge rate with the screen on and it looks like full 1.5A with the screen off. Maybe a defective QI charger?
Nope. Everything is normal. You just need a better cable that will manage to transfer 2A of current.
QI charger needs 2A input to give 1A output on a coil. Giving about 70-80% efficiency rate, your phone would be getting about 700-800mA.
Since your charger gets only about 1A input it gives about 500mA output. Therefore giving that efficiency rate, your phone should be getting about 350-400mA tops. It is possible that your charger has lower efficiency rate (some have about 50-60%), so the values that you're getting are pretty normal unless you use a premium micro usb cable, preferably with thicker, like AWG24 or lower (the lower value the better) power wires.
Might want to try these cables, a lot of people have had great luck with using them on Qi chargers. Don't know which length you would need, they have 3 and 6 foot cables. For the price, I'm ordering 6 6ft cables.
http://www.monoprice.com/Product?c_id=103&cp_id=10303&cs_id=1030307&p_id=9762&seq=1&format=2