Charging station complete

FireFrog

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Jan 22, 2017
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I'm really excited that my parts came in and finally assembled my charging station
Not 100% sure if I wired it right (I tried to go for one tp4056 to charge two 18650 cells) so 500mah each
Does this also meanif I remove one cell that reminding cell charges at 1ah?

Now to charge my cells and check capacity
 
1:1 i would also agree with, if one cell is a higher capacity than the other, it will take the majority of the current, and it ends up taking just as long to charge as 1:1
 
I see nothing wrong with your setup. I charge mine at about 0.625A (5A in to a 8P board) prior to capacity testing. Once they're fully charged, I stick them in the capacity tester tops them off to 4.22v and starts the discharge test. Precharging them like this makes the testing process go much faster. I assume you're sticking yours in a capacity tester once you finish charging them with the above setup and doing the same thing?
 
mike said:
I see nothing wrong with your setup.

What happens when a flat/dud/shorted cell is mated with a good cell that's still holding a decent level of charge ?
 
Sean said:
mike said:
I see nothing wrong with your setup.

What happens when a flat/dud/shorted cell is mated with a good cell that's still holding a decent level of charge ?

I guess I should have clarified. I check all of my cells with a voltmeter prior to sticking in. Nothing lower than 1.5v goes in. Ones that are 0.5-1.49 are charged separately and 0.49v and less are binned.
 
Well I plan to just waiting for those to arrive in the mail
I'm following jehu Gracia and I'm his videos he sets aside cells after a charge to allow for a small time to self discharge
Then take the remaining cells that still have a good charge to use in a bank


So quick question
If I put a cell that's 2v and another that's 3v does the 3v cell get overcharged?
Or is it evenly charged?
Also my multimeter doesn't check current so I'm unsure if it's actually 500mah each cell
 
FireFrog said:
If I put a cell that's 2v and another that's 3v does the 3v cell get overcharged?
Or is it evenly charged?

The 3V cell will attempt to instantly charge the 2V cell so the voltages are the same.
For technical reasons it won't be instant, but high currents will be involved.
This is bad because:
1) You drain the 3V cell to far.
2) You want to charge the 2V cell slowly so as to not cause damage.
3) Both cells could get hot.
 
station240 said:
FireFrog said:
If I put a cell that's 2v and another that's 3v does the 3v cell get overcharged?
Or is it evenly charged?

The 3V cell will attempt to instantly charge the 2V cell so the voltages are the same.
For technical reasons it won't be instant, but high currents will be involved.
This is bad because:
1) You drain the 3V cell to far.
2) You want to charge the 2V cell slowly so as to not cause damage.
3) Both cells could get hot.

They balance each other out. I don't think it's really a concern. Like I said above, I precharge 8 cells at once per charger. I throw in 1.5v and 3.9v together all the time. I have charged thousands and none get hot (Sanyos aside) or blow up.
 
My last 100Sanyos i had no issues with what so ever. Depends on what type of batch you get i would say.
 
any warmth is concerning to me
So I put those aside


Oh another question
So since a cell at a higher charge will transfer energy to level everything out is that bad for my tp4056 modules at all?
Or is it just cell to cell?
 
It's just cell to cell - if your inter cell connections can handle the current, and you don't mind abusing either cell, and you don't understand the risks, just slap them in parallel irrespective of their charge state
 
Is there a better way to arrange cells other than soldering?
Something easily interchangeable if a cell goes bad so it's not so tedious to unsolder each cell
 
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