0

USB / DC / Solar Lithium Ion/Polymer charger - v2
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

USB / DC / Solar Lithium Ion/Polymer charger - v2

by scotch1 on Thu Jun 08, 2017 12:17 am

Recently purchased this item Adafruit Micro Lipo - USB LiIon/LiPoly charger - v1 https://www.adafruit.com/product/1304
" When the battery is fully charged and ready for use, the green LED turns on. Seriously, it could not get more easy."

Except it stays red all day and never goes to green. tried on both a small and large LiPo, purchaed from Adaruit.

Any reason?

scotch1
 
Posts: 34
Joined: Mon Nov 26, 2012 12:13 am

Re: USB / DC / Solar Lithium Ion/Polymer charger - v2

by adafruit_support_bill on Thu Jun 08, 2017 5:50 am

Which LiPo cells are you attempting to charge with it?

adafruit_support_bill
 
Posts: 59678
Joined: Sat Feb 07, 2009 10:11 am

Re: USB / DC / Solar Lithium Ion/Polymer charger - v2

by scotch1 on Sat Jun 17, 2017 5:41 pm

LiPo 3.7v, one is 150 mA and the other is a 1500 mA. The 150 actually seems to show a "done green ligght", but the bigger one didn't after a day.

Also, Is there a safe procedure for putting 3 LiPo 3.7V in series to power a 9V device?

scotch1
 
Posts: 34
Joined: Mon Nov 26, 2012 12:13 am

Re: USB / DC / Solar Lithium Ion/Polymer charger - v2

by adafruit_support_bill on Sat Jun 17, 2017 5:52 pm

The Micro LiPo charger is designed for charging smaller cells, so it has a low charge rate. The 1500mA cell will take at least 10 times longer than the 150mA cell.

We do not recommend wiring cells in series. Small manufacturing variations can result in large imbalances in use. If you need a higher voltage pack, we recommend that you purchase one pre-made with factory matched and balanced cells.

adafruit_support_bill
 
Posts: 59678
Joined: Sat Feb 07, 2009 10:11 am

Please be positive and constructive with your questions and comments.