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USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells
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Please be positive and constructive with your questions and comments.

USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by jr10 on Thu May 09, 2013 4:47 pm

Hi.
I was wondering if someone could give me a little direction with a project I'm plying with. I am very new to all of this and could use the help. I was planning on purchasing your USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells.ID 280 I was also going to purchase your Lithium Ion Battery Pack - 3.7V 6600mAh -ID: 353. I have 3 Radio Shack 6V solar cells wired in series with the resulting Voltage at 22.8 Volts at .16 amps. I figure this to be about 3.5 watts. My question, will these panels work with that charger?
Thank you in advance for any help.
Regards.
Jay
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Re: USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by adafruit_support_bill on Thu May 09, 2013 6:02 pm

My question, will these panels work with that charger?

Not all in series. These chargers are designed for 5-12v input. You would also be better off with a solar-specific charger. Standard LiPo chargers will work in ideal conditions, but do not handle variable sun conditions very well.

You may want to read through our design notes for the solar version of the charger.
http://learn.adafruit.com/usb-dc-and-so ... sign-notes

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Re: USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by hammerstorm on Mon May 13, 2013 8:11 pm

I put together the solar lithium polymer battery charger, a li poly battery, and a minty boost to make a phone charger. I am using a solar panel that outputs ~8V in sunlight. I left it out charging for about 5 hours and it did not say fully charged. When I plugged my phone (iphone 5) into the charger it charged it up about two percent and showed the lightning bolt symbol. then it showed the wall plug icon indicating "full charge" and my phone started draining while it was plugged into the charger. Do you think the solar panel I'm using is the issue? I tried another solar panel that output 4.9V but after some reading I found out that it wouldn't work.... any ideas?
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Re: USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by adafruit_support_bill on Tue May 14, 2013 5:53 am

8V is too much. The charger is designed for 6v max. In load-sharing mode it would pass most of that 8v through to the Mintyboost which is designed for 5v max. Since the Minty is not designed to regulate voltages over 5v (it is a boost converter) it is likely that more than 5v will be going to your phone. All-in-all, not a good situation.

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Re: USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by hammerstorm on Mon May 20, 2013 10:06 am

I just ordered this solar panel:
http://www.adafruit.com/products/500

If I use this solar panel will I have to solder in a 1K resistor? since the current is over 500mA?
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Re: USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by adafruit_support_bill on Mon May 20, 2013 10:10 am

No need for a resistor. The current draw is determined by the load.

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Re: USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by hammerstorm on Fri May 24, 2013 1:35 am

Ok, so I am now using the new solar panel and it is doing basically the same thing. I now have the li poly battery connected to the adafruit USB charger and after about 6 hours the LED on the charger is still red. do you think the battery is the issue?
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Re: USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by adafruit_support_bill on Fri May 24, 2013 6:06 am

What battery are you using? High capacity batteries can take a long time to charge.
Also, as noted in my initial reply on this thread, the USB/DC LiPo charger is not really a good choice for solar charging. It is not optimized for a solar panel source as described here: http://learn.adafruit.com/usb-dc-and-so ... sign-notes

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Re: USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by hammerstorm on Fri May 24, 2013 10:28 am

The battery I am using is the 1300maH li poly battery off of your website. I tried charging it with this:

http://www.adafruit.com/products/1304

However after about 7.5 hours there was no green LED.

Here is a picture of the setup I have.
https://www.dropbox.com/sc/f1zrdtkba5n0ksh/7FgxnZslK9

Do you think using the higher voltage solar panel messed up my battery? so far I havent gotten it to say fully charged using the USB charger or the solar charger.
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Re: USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by adafruit_support_bill on Fri May 24, 2013 11:33 am

It could have messed up the charger, the battery, or both. The charger max input is 6v. There are no guarantees about what gets passed through to the battery if you use a higher voltage.

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Re: USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by hammerstorm on Fri May 24, 2013 3:38 pm

Last question, I promise :) you have been very helpful. Im thinking I might get a higher capacity battery since I have to order one. will this one work with my setup?

http://www.adafruit.com/products/354
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Re: USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by hammerstorm on Sat Jun 01, 2013 12:20 am

Update: Bought a new battery and everything works fine now.
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Re: USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by yoonpoh on Thu Aug 08, 2013 10:48 pm

Hi I would like to know if this polymer battery charger can support 13600mah if i make 4 batteries 3400mah in serial.
Can i customize to add on another android usb port on the board?
Hope to hear from you soon.
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Re: USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells

by adafruit_support_bill on Fri Aug 09, 2013 5:41 am

13600mah if i make 4 batteries 3400mah in serial.

This charger is for single (3.7v) cells only. To perform balance charging of multiple cells in series - see: http://learn.adafruit.com/multi-cell-lipo-charging

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Please be positive and constructive with your questions and comments.