balance charging 18650's / 26650's

Agh - just noticed one of the pics has the black from the charger as well as the balance lead connected to the +ve terminal :frowning:

Found the manual online but impossible to follow as it must be for printing the booklet. Diagram on pg 18 shows +ve to +ve but not sure how you tell which balance lead is which.

http://www.racing-cars.com/downloads/CORE_UAC40_Manual.pdf

Also now confused the heck of me as to what settings to use for - 3 x 5000mah 28650 in series - more reading to do before anything gets plugged in!

Go to Series charging setup should help

Ok, that looks like how I originally thought it worked and is straight forward. Not sure why have I seen comments and pictures with a red wire being heatwrapped black and vice versa though.

Like here it has the red balance lead on the -ve charging terminal/-ve cell end.

and here everything appears to be back to front

There is so much out there that does not match up and some of the pics diagrams and cable pin outs urghh.

Not sure what is in the air but a lot of us seem to be going down this path at the moment.

It's hard to tell what's happening with the wiring in the first pic in post 103. In the second pic the cells to appear to be connected backwards. It also appears that the charger is not powered up, so it may be that the author set it up for the photo and did not notice that it was incorrect.

I can vouch for the diagram in the thread linked above, with the caveat that I used three and four wire balance port connectors instead of the seven wire connector illustrated in the diagram.

This post has some photos of good examples.

Hi! It is normal that when i check the end voltage between my SKYRC 6X80+ and the battery (with voltmeter) ,i have 3.99V but i have programmed for stop charge at 4.2, but in reality when i remove the battery and check with voltmeter i have just 3.99v.

All of my battery is news and protected, i have double checked with an other voltmeter…

It is a default of my charger??

thanks

I dont know the charger but I’ve found that usually they are set to stop below 4.2V, especially if it doesnt terminate correctly (turn off after its done charging). Make sure its doing the same thing with all the batteries, not just ONE, because then thats a different story and your battery may be old/bad. My cheap TR-006 chargers stop at 4.10V and then continue to slowly charge, so its dangerous to leave batteries in the chargers for long periods if yours does this too. If it does stop at 3.99V with all the batteries, on the bright side it will extend the life of your battery (more recharges before you have to throw it away) to stop at 3.99V if that helps any. :slight_smile:

Hi! Thanks for your respond.

i charge only one battery 18650 for flashlight, but i program my charger at 4.2V but the charger finish when he is at 4.2V, but when i remove the battery and i check with my voltmeter i read 3.99 or 4V, this is the same thing with others 18650 battery, this is not because my battery is bad or old, this all news battery or 3 months or less…

my charger is this : http://www.skyrc.com/index.php?route=product/product&path=20&product_id=70

Do you have another charger, to see if the cell will charge to a higher voltage?
Has this cell ever been charged to a higher voltage?
Has this charger ever charged another cell to a higher voltage?
How long have you had the charger?
It is possible to set different termination voltages for different types of cells. Are you certain you are setting the same cell type that you set the termination voltage for?

benckie, Hi I was looking at your posts for chargers. I need to build a 4 cell (18650) parallel holder with balance leads. I have not been able to find a wiring schematic anywhere. I am not an RC guy just someone who wants to use loose cells in flashlight and usb portable power devices. I was confused by you post that just showed the two cell holders because it looked like I counted one red and 3 black leads coming from the balance plug. Can you help me with a 4 cell schematic (both power and balance leads). Thanks a bunch.

Balance charging uses a series setup. Here is a diagram by moderator007 that should give you what you need

In other words, parallel cells balance themselves.
They have no choice but to have the same voltage as each other, because they’re hard-wired together in parallel, acting as 1 big cell.

I was looking for a wiring diagram for a 2-4P setup with balance leads. For charging of loose cells

You will find this useful:

http://scriptasylum.com/rc_speed/lipo.html