Sanyo UR18650WX 1500mAh@20A cells 13 miliohms !!

[Doctorbass]

I am testing some not really "new" cells on the market ( Dewalt are using them from about 2 years in the 20V 5 cells packs)

I am really impressed by their performances.

These cells are made for high power at any temp.

Technical Parameter:
Model: Sanyo UR18650WX
Material: Li-ion
Voltage: 3.6V
Capacity: 1500mAh
Maximum Continuous discharging current: 20A I wonder what is their peak discharge... 40A ! well according to their RI, these can certainly take abuse!
Max. Durable 350 cycles: 15A... Probably over 500-600 cycles at 1C or less
Dimension: Height 65 mm, Diameter 18 mm
Weight: 42g

But .. They are difficult to get and i only have few of these cells but they are promissing. They are availlable on ebay for about 7$ each

From the 2 packs i dissassembled here is what i got at continuous discharge at 10C ( 15A) from 4.20V down to 2.8V

no_RI___cap____
1 13.26 1.526
2 12.96 1.559
3 13.37 1.497
4 12.99 1.551
5 13.09 1.576
6 13.28 1.547
7 13.33 1.513
8 13.10 1.555
9 13.27 1.513
10 13.38 1.555
11 13.70 1.497
12 13.54 1.518
13 13.30 1.514
14 13.49 1.509
15 13.56 1.513
16 13.78 1.501
17 13.61 1.505
18 13.56 1.509
19 13.57 1.505
20 13.36 1.509

What is impressive is their RI !!! only about 13.5 miliohm !!




Doc