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Liitokala Engineer Lii 500 Charger
#41
Photo 
much simpler cooling

https://photos.google.com/photo/AF1QipOb...2CkDaXpE-4


https://photos.app.goo.gl/XDMZuZpWhBA9uvDRA
Battery is li iron using 18650s, 14s, 0p, and growing cell so far 300, untesteded.
Bms is a diy open source by stuartpittaway.
No solar yet, 
Building wind turbine, 48v im after a 48v motor if anybody has one for sale.
Cells 2000 to 2500ma.
Cells 1500 to 2000ma.
Cells 1000 to 1500ma.
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#42
First run with new Liitokala Engineer Lii 500 Charger using a 12V 2.8A power pack on 240V. I put CGR18659E cells (original capacity 2550mAh (3V)) harvested from laptops in each of the 4 slots and ran the default Nor Test.

Code:
Slot    V    mAh    Time    mR
1    3.87    2419    9:33    61
2    3.91    2335    9:13    63
3    3.90    2327    9:11    64
4    3.87    2419    9:33    61

* How do I interpret these tests, particularly the mR which I understand is unique to the Lii 500?
* I understand with Nor Test by default cells in 4 slots would charge at 500mA to 4.2V and discharge at 500mA to a bit below 2.9V (I observed below 2.81V) cut-off. Can someone confirm charge/discharge parameters?
* I realise these tests are only a guide, particularly with temperature variations (the outside temperature ranged from 18 to 33 degrees C but we are heading into warmer weather). How much difference does seasonality have on the tests and is anything normally done in practice to manage it?

* I intend to stick with the same testing methodology so I can get relative cell performance. Is there a more practical methodology for capacity and internal resistance with the Lii-500?
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#43
Default NOR test settings are 500mA charging / 250mA discharging.
Dont bother too much with mR. You will spend precious time for nothing. You can learn more about cell when you leave it for 1-2 months and check self discharge.
Its simple - all cells with very low self discharge and without any heat(40-45C) at 1A discharge /500mA charge are good for me.
My tests are like this:

1. Salvage batteries.
2. Split batteries in groups - above 2.5V can be charged to 4.2V - i use multi TP4056 diy charger for this.
- cells with voltage 1V - 2.5V are charged with 100mA to 3.7V and i leave them for couple of days. After that i charge them to 4.2V.
- cells under 1V are charged with 50mA to 3.7V and i leave them for couple of days. After that i charge them to 4.2V.

All cells will rest for about month. After that i test capacity for all cells above 4.15V. All cells with capacity 80% or higher from original are ok. Write capacity and charge cells again. If there is no SD after 2-3 weeks - just use cells. Cells with capacity under 80% goes to some minor projects. Cells with small SD (4V - 4.15V after full charge) can also be used for flashlights or something. Cells under 4V are bad and goes to recycle bin. Same for all heaters (read Panasonic and Sanyo).
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#44
(08-12-2019, 09:49 AM)KaminoReal Wrote: I added a 80mm fan on mine, now is cool but noisy LOL.


I Velcro'd on a 40mm fan to the lower backs of mine where the openings are.  The fans are almost silent and plug into the computer power supply that I use to run the Lii-500s.  I've never been comfortable with the wall chargers that come with the Lii-500.  They don't regulate output well at all and although the Lii-500 may regulate incoming current I'm betting the PC desktop power supply does a better job.
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