Drokz
1 W
hehehe, yes iam asking to you 
How do you recognize a real panasonic 18650pf battery
- Thread starter Drokz
- Start date
Drokz
1 W
I'm very curious about your test results!!
cwah
100 MW
I would be interested too.
I wonder if he sells authentic ncr18650pf but rejected or something like class D. So capacity would be lower than class A for example. Or cell needs to be balanced more frequently. Or cells to cells do not have consistent capacity...
Keep us informed.
I wonder if he sells authentic ncr18650pf but rejected or something like class D. So capacity would be lower than class A for example. Or cell needs to be balanced more frequently. Or cells to cells do not have consistent capacity...
Keep us informed.
I'm waiting for other cell to finish, but in the meantime here is the weight of one PF:
I've also measured some random cells, they are between 45.87 and 46.22 g. Cells are rank C, and they are from 14.07.2013.
I can only test one cell, so unfortunately cant see if they have same capacity, but after I weld them into 4p I will measure each bank separately, and we'll see if they got the same amount of mAh into them while charging.
I've also measured some random cells, they are between 45.87 and 46.22 g. Cells are rank C, and they are from 14.07.2013.
I can only test one cell, so unfortunately cant see if they have same capacity, but after I weld them into 4p I will measure each bank separately, and we'll see if they got the same amount of mAh into them while charging.
Cephalotus
10 kW
- Joined
- Jun 18, 2012
- Messages
- 755
riba2233 said:
I assume they have printed C 4713 on them. Those have been charged on 13. July 2014 in the factory.
I bought two batches of NCR18650PF cells from nkon. They seem to be the real thing. Easy to solder, too.
okashira
10 kW
Ok, I got a pretty decent temporary "true" 4-wire measurement setup
Charger was showing just under 4.2 so I cut at 90mA.
This is the cell that I shorted a couple times, pretty sure it saw 100A+ for 3-4 seconds.
Compare to HKJ's measurment of an Orbtronic PF cell below.
Looks legit, but I was seeing slightly higher impedence if you overlay the charts. Could be my lower starting temperature, but I did cut at 2.75 instead of 2.8.
Charger was showing just under 4.2 so I cut at 90mA.
This is the cell that I shorted a couple times, pretty sure it saw 100A+ for 3-4 seconds.
Compare to HKJ's measurment of an Orbtronic PF cell below.
Looks legit, but I was seeing slightly higher impedence if you overlay the charts. Could be my lower starting temperature, but I did cut at 2.75 instead of 2.8.
bgt
100 W
Have just installed 40x Panasonic NCR18650PF batteries in a Bottle Battery(36V) casing. When testing with a 4 ohm load it will give 10.7A/h output. So it is about 2675ma per cell. Code Cell: C4310
Comparing it to my Bottle Battery(36V) filled with 50x Samsung 2.2E it sure gives more power when the lower part of the discharging curve is reached. It keeps the battery alive a bit longer, I mean before motor switch off @30V occurs.
Tested with a Bafang 250W midmotor. Testcase: course with full throttle.
Comparing it to my Bottle Battery(36V) filled with 50x Samsung 2.2E it sure gives more power when the lower part of the discharging curve is reached. It keeps the battery alive a bit longer, I mean before motor switch off @30V occurs.
Tested with a Bafang 250W midmotor. Testcase: course with full throttle.
bgt
100 W
Ok, I tested the internal voltage loss of some of my battery packs with a 4 Ohm load:
Panasonic battery, 40 cells
@ 41V output.............2.5V total, 2V=battery pack only = 80 mOhm p/cell
@ 37,6V output..........1.5 V total, 1V=battery pack only = 40 mOhm p/cell.
@34,5 V output..........1V total, 0,6V=battery pack only = 24 mOhm p/cell
Hobbyking 36V/5A 25C Lipo battery total loss is 1V@41V. 10 pouch cells.
Lifepo4 battery made of Wina10A cells: total loss 2V@41V. 12 cells.
I was a bit surprised to see this kind of losses on ebike batteries.
Panasonic battery, 40 cells
@ 41V output.............2.5V total, 2V=battery pack only = 80 mOhm p/cell
@ 37,6V output..........1.5 V total, 1V=battery pack only = 40 mOhm p/cell.
@34,5 V output..........1V total, 0,6V=battery pack only = 24 mOhm p/cell
Hobbyking 36V/5A 25C Lipo battery total loss is 1V@41V. 10 pouch cells.
Lifepo4 battery made of Wina10A cells: total loss 2V@41V. 12 cells.
I was a bit surprised to see this kind of losses on ebike batteries.
SniperGaulois
10 kW
My ones have two RFID tags on them. with a square and letters like JA #C K1 two of them weigh 460.0
bgt
100 W
Did a lot of ebike tours with the battery lately and it appears it has the best energy in the middle of the graph. Topend will be used very quickly to stay with midrange. So 4Volts is quickly going to 3.6V. Good energy volume anyway. Better then my 50x 2.2E Samsung cells.