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Panasonic NCR18650 Cell Specifications
#11
(01-23-2020, 10:32 PM)mike Wrote:
(01-22-2020, 10:33 PM)base2 Wrote: i just started a NORM Test on my LiitoKala li-500 at 1000mA with 4 these.

The Littokala does not test at 1000mA. The highest current it tests at is 500mA.


So the 1000mA is for charging only? 

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#12
Yeah. When you set 300 or 500 discharge current will be 300/when you set 700 or 1000 discharge current will be 500. Charge current will as you set.
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#13
(09-11-2019, 08:11 PM)Eduardo Kang Wrote: Does anyone have any experience salvaging these cells?  I charged a few up last night at 700ma and they got up to ~45c once they were over 4v (4.01-4.1), I puilled them from the charger as soon as I noticed.
I just recycled 6 of these cells from a discarded laptop battery. The cells were manufactured wk 42 in 2015 (4y 4m old, i.e., not exactly brand new), and all had a voltage b/w 2.0 and 2.5V, which normally implies that you shouldn't expect the remaining capacity to be too high. I charged the cells @500mA using an XTAR VC2, and discharged them with él cheapo TP4056, starting at a bit over 1A, and decreasing to ca. 850mA at the end voltage, 2.7V.

Result: all cells yielded 2600mAh+ (2602, 2615, 2622, 2625, 2639, 2662), which is by far the best I have ever seen. I have recycled hundreds of 18650 cells, and i don't remember ever getting more than 2.2Ah. Granted, my sample size (6 cells) is small, yet, especially due to the relatively low starting voltages and the age of the cells, I would classify this model as excellent.

What comes to the temperatures, I would say that in normal charge/discharge tests, 45'C is definitely nothing to worry about, but 60'C probably indicates that there might be a puncture/contact b/w the roll layers, i.e., the cell is not safe to use or store in charged state.
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#14
Maybe someone will be useful
8 cells 2007 (0711), 4 pairs - I did not separate them. iMAX B6
Initial voltage: 2,0-2,1 V

Sequential testing each pair: 
1. starting circle: charge CC-CV (1A, 4,20V; further similarly) - pause 30 days - discharge (1A, 3,00V);
2. capacity testing: charge (1A) - discharge (1A) - charge (1A);
3. self-discharge testing: pause 50 days - discharge (1A).

Results:
capacity - 4648-4674 mAh;
efficiency - 0,90-0,91; 
residual capacity - 0,8;
self-discharge for 50 days - 6%.

Separate test for one pair in storage mode: step current charge up to V=3,85V - step current discharge to V=3,00V (init.cur.=1A)

Result:
capacity - 0,75 (ordinary in this mode - ~0,6);
self-discharge for 30 days - 1,7%

Resume: very good cells Smile
In general, all of the old Panasonic that I tested (CGR and NCR, 2003-2009 and even 1996 Smile ) were always good.
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#15
I am early in this process but getting a tentative feel for cells from laptop packs.

Found 6 of these cells in a Dell 60Wh pack (lower capacity Dell packs seem to use more brand variety where 65Wh+? have mostly been Samsung in my small sample of 10-15 packs).

The NCRs came out at ~2V while one cell with small bubbling (first for me out of ~80 cells) on the side, and it's partner which was visually good, were at 1V. Both discarded. The other cells tested to 2600-2700mAh which was fantastic. We'll see how they hold up over time and a couple more tests.
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