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Charging to 4.3v
#1
Hey team,

I have just purchased some charger units for a bit of an experiment and turns out they use a USB plug in and give a 'full' charge as indicated by a green LED. 






I then threw them in the opus once charged and they came up with a voltage of 4.3v on each cell! 

What are peoples thoughts on that level of voltage? As I understand 4.2 is full and 4.3 is getting dangerous?
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#2
(05-31-2019, 10:20 PM)Scottietheyoung Wrote: Hey team,
I then threw them in the opus once charged and they came up with a voltage of 4.3v on each cell! 

What are peoples thoughts on that level of voltage? As I understand 4.2 is full and 4.3 is getting dangerous?

Most cell manufactures have a 4.2 ±0.05 V spec on their cells. Also some cells actually go as high as 4.35V.
If the cell gets to 4.25 and the Opus decides to round up that would be your answer. Also the OPUS as a voltmeter Huh  Im not sure I would trust it that close. Best would be to check the voltage with a minimum of a 3 decimal place DVM or better yet with a 4. Big Grin



Wolf
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If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
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            Cool
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#3
Life shortening if done regularly.
Some cells can take 4.3(5), most probably won't like it but not dangerous.
4.1 = full is the target for longer term power wall use, for capacity testing you're trying to follow the manufacturers specs hence 4.2V

+1, find a voltmeter you trust!
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Running off solar, DIY & electronics fan :-)
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#4
Take the unit apart and see if there's a switch inside to change from normal cells to HV (high voltage) cells. Maybe it's default setting is HV instead. But, I doubt this is the case. Even the Opus has 2 charge levels, but it's 4.2 and 3.7 (for LiFePO4 cells).
It's also possible you have a bad charger, even if new.
Proceed with caution. Knowledge is Power! Literally! Cool 
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#5
I'm in the process of bringing all mine down to 4v top voltage to try make them last as long as possible. but like wolf said, trust neither for a true reading
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#6
(05-31-2019, 11:58 PM)Korishan Wrote: Take the unit apart and see if there's a switch inside to change from normal cells to HV (high voltage) cells. Maybe it's default setting is HV instead. But, I doubt this is the case. Even the Opus has 2 charge levels, but it's 4.2 and 3.7 (for LiFePO4 cells).
It's also possible you have a bad charger, even if new.

possible but that looks like another cheap and nasty charger i had.
i knew it was crap when i got it for $5 at the flea new in box.
it had no real cc or cv modes and while testing it shorted placing full 5v across that slot.
that could lead to a nasty surprise.
the sliders were so crappy it wasnt even worth re-purposing as a universal holder.
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#7
(05-31-2019, 10:20 PM)Scottietheyoung Wrote: I have just purchased some charger units

Don't buy unknown shit. Take reliable chargers like Miboxer ones

My review of 4-slot Miboxer C4-12

Voltage and current accuracy check:
[Image: 3b2606.jpg]
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LiFePO4: QB26650 2500mAh 50A vs A123 ANR26650M1B: https://youtu.be/GOSkte11lRc

Yinlong LTO Lithium Titanate safety tests: https://youtu.be/eAUYbSDEy6I
Toshiba SCiB LTO Lithium Titanate safety tests: https://youtu.be/XsrRDZxEFQE

XTAR DRAGON 4-slot battery tester review: https://youtu.be/S6yVMsIuauE
Miboxer C4-12 4 slot x 3.0A charger review: https://youtu.be/X-ww1YALjvU
Miboxer C2-4000 smart battery tester review: https://youtu.be/jrbJceNXv1g

Samsung 33J for TESLA: https://youtu.be/7FMxgMmPeh4
Samsung 40T - a high drain 35A 21700 cellhttps://youtu.be/lxgKWiQ9580
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#8
Thanks team, they were super cheap and definitely nasty. As I said it was a bit of an experiment for me to see what you could get for that pitiful amount of money. The internals were appalling when I opened it up. Will bin and build charging board.
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#9
real voltage should be 4,25(0,05v off by opus)
Building Lifepo4 Powerwall - atm 1400 cells growing

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#10
(05-31-2019, 10:20 PM)Scottietheyoung Wrote: Hey team,

I have just purchased some charger units for a bit of an experiment and turns out they use a USB plug in and give a 'full' charge as indicated by a green LED. 




I then threw them in the opus once charged and they came up with a voltage of 4.3v on each cell! 

What are peoples thoughts on that level of voltage? As I understand 4.2 is full and 4.3 is getting dangerous?

I have 6 of them. All of them overcharge to between4.23-4.28 V. I bought a tube of TP4056 with the plan of replacing the ICs in them, but the pinout is different so it’s not based on that. Been thinking about etching a new PCB for it but I would need to desolder and move the “hooks” for the springs.

(05-31-2019, 11:58 PM)Korishan Wrote: Take the unit apart and see if there's a switch inside to change from normal cells to HV (high voltage) cells. Maybe it's default setting is HV instead. But, I doubt this is the case. Even the Opus has 2 charge levels, but it's 4.2 and 3.7 (for LiFePO4 cells).
It's also possible you have a bad charger, even if new.

Nope. Unbranded IC/scraped the letters off them. Termination voltage seems internally set by bandgap reference, or in this case badgap reference.
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No. cells
Indexed: 53
Processed ok, not yet indexed: ~3200
Broken down, untested: ~0
Not yet broken down: ~200 kg
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