+1,I also was lead to beleive these tobe Panasonic cells.Infact the supplier[Bestvapping] posted the info on another thread.May do a check myself over the weekend.
DON…
Well , its not capacity in direct relation to energy stored :
Its voltage sag : @ 3amp discharge , the voltage sag is severe , [ on my charger ] Turnigy Accucell –8150
The other charger is a Imax B6 , so only discharges to 1A
I did voltage calibrate the Turnigy when I got it …
Might recheck it right now …
Hmmmm, been thinking of getting another charger !
As for the battery ? Not sure the re-seller has much choice as to what goes into the components …
But these batteries were only just sourced this month …
So ??
I have no direct experience with Blazar, but they look to be keeppower OEM. Efest make top quality batteries too afaik so I personally would not question either of these cells being genuine. Maybe something to do with the testing set-up?
I would 2nd a 3 amp test on some unprotected and clearly genuine Panasonic cells to verify this if possible.
Actually its the charger !
Looks like the higher the discharge rate - the higher the discrepancy on calibration …
So at 3 Amp the actual true cut of voltage was = 3v and not 2.7v
So at 3Amp its 3 tenths out , so charger is reading 3 tenths less than actual true MM read voltage …
So let me adjust that a little : Termination voltage would be 3v @ 3amp current draw …
Update : 3A = 3 tenths out , 2A = 2 tenths out , 1A = one tenth out … Wow !
Hmmm , Turnigy looks to bite some what …
Hmmm , even the Imax B6 is one tenth out @ 1A discharge …
Charger sais 3.8v and MM sais 3.9v so , is this normal behavior ?
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You guys want to check ?
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Charger sais Voltage = ? @ Discharge rate - Multi Meter sais Battery is ? @ Discharge rate
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Let it discharge for a few minutes to stabilize , since both my charger behave this way , I can only assume its normal …
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And the issue may indeed be the batteries themselves ,
Your Blazars are protected and put out over 5 amps?
Have you considered the possibility that there may be a significant degree of resistance in your discharge setup? For example, I use cheap single bay chargers with the circuitry removed, hooked up to my Hyperion EOS1210i. One of them is unsuitable for high current discharge tests because when using it, the voltage almost immediately sags to around 3.4 when doing a 3A discharge on a fresh cell. Using the same cell in a different bay that applies significantly more contact pressure on the battery terminals (and probably has lower resistance internally as well) results in a voltage reading slightly above 3.7 at a 3A discharge, which is right where it should be for a freshly charged cell.
Discharging at 5A drives the point home. All my Blazars will fail dismally in the high resistance bay, with the setup sagging to 2.7v within seconds. In the better one, they’ll stay at just over 3.5v initially, and discharge in a much more respectable manner from there.
Even my good charging bay needs improvement I think. I’m going to get stuck into fixing them both up soon.
Sure. That’s not uncommon for a good low resistance protection circuit. The Blazars are certainly not the only cells that can do it.
I have some protected Eagletac 3100mah 18650’s that struggle to put out 3 amps. Fairly new also. It is why I use unprotected IMR’s mostly.
And you’re certain that it’s not your DMM that is doing the struggling? High resistance leads, and cheap inaccurate DMMs, are probably the true source of much of the woe regarding lower than expected current readings.
EDIT: Nevermind. If you can actually measure the superior performance of your IMR’s, I guess the variance is indeed in your cells.
I took tailcap readings on a C8 and got 2.9 amps with the Eagletac 3100’s. With the IMR’s I get 4.5 amps.
Curious. You can find your cells reviewed on HKJ’s site (in his battery comparator too) and his sample was certainly capable of putting out 5A.
It seems like the protection circuit kicks in too soon on my Eagletac 3100’s. I use them in my flashlights that draw lower amps.
Thanks for the info.
Generated by HKJ’s Battery Comparator
He obviously observed lower than expected performance as well it seems.
I guess I need to get me some Blazars.
MM is measuring Voltage - Measuring voltage is not an issue …
I may need to look at the battery carriers - I did buy some new ones …
Take a look at HKJ:s solution for his discharge tests, that clamp solution seems to work real good for him.
That looks interesting …
I made up a new heavy duty battery carrier , and the situation remains the same , very slightly lower resistance , maybe 0.03
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Variance between charger reported voltage and actual battery voltage remains almost 0.3v at 3A discharge …
So would be nice if some of you guys could check what your getting …
This is interesting , but I just dont have the time , exams next week , and I just did 11 hours of home work yesterday …
Time is precious ATM
But I just may need to set up a way to monitor Battery voltage during discharge so as to terminate at actual battery voltage rather than the voltage reported by the charger …
So after my exams , I may run a whole bunch of 3A discharges …
Ok here is a video …
My charger reads 0.02v high when monitoring resting battery voltage (confirmed with 2 different DMMs ). Taking this into consideration, I lose a total of 0.08v between the battery and the charger during a 3A discharge with the setup I am using (again confirmed with 2 different DMMs ).
Still trying to improve this.
0.08v That looks rather good …
Im going to have to change the way I discharge , and go with what I have in the video , use a MM to keep an eye on battery voltage and terminate on what the MM say’s rather than trusting the Turnigy charger …
My other MM measures to 0.000 if memory serves , so looks like some work ahead of me .