shopping cart empty
WORLDWIDE FREE SHIPPING

BAD Version 7.1 (HKJ test/review)
Login to post a new topic and to write a reply.
Thread Tools Rate This Thread


Search within thread:

Login to rate this thread.
#31 (permalink)      3/5/2015 6:29:23 PM US Central   quote/reply + tips
JPBel
Member
  • JoinedAug 2014
  • Posts 3620
  • Reviews 80
  • Kudos1955
Hiko9 wrote:

some cells state 4.25 as max voltage. I would say anything above 4.25v is a serious problem


And you would be right for many of lithium batteries.
The 3.6V nominal ones for sure.

The Constant Voltage(CV) use for charging and the voltage the batteries will reach are 2 different things tho.

With good chargers, battery is considered full when the charging current drop below CC/10(1%~3%) of the programmed charging Constant Current(CC).
Ex: Some batteries will only charge to 4.09V while other to 4.21V, on the exact same charger.

Terminating the charging process based on voltage should only be done as a failsafe, in case the current never drop low enough.

Some peoples think it is the voltage that is dangerous, it is not per say.
It is the "not absorbed mW/s" over what the battery is capable of that is the problem.

Ex: Charging a 2000mAh battery with a CV of 4.35V and a CC of 1000mA will cause no problems, as a 2000mAh can safely be charged with a CC of 1600mA at 4.25V.

1000*4.35=4350mW vs 1600*4.25=6800mW, the first is 0.5C of 2000mAh and the second the recommended 0.8C for charging 18650.

At very low mW/s over, only premature aging will occure.
At high mW/s over, overheating will occure, and there will be greater risks of the battery short circuiting itself.

While a CV of 4.35V is safe for high capacity batteries with most charger, it won't be the same for low capacity ones unless the CC is limited much lower.


Edited on 3/5/2015 at 7:56 PM. Reason:
#32 (permalink)      3/5/2015 8:22:24 PM US Central   quote/reply + tips
Avatar
Schnarph
Member
  • JoinedMay 2013
  • Posts 2621
  • Reviews 225
  • Kudos2405
+1 details
JPBel wrote:

What is the CV open voltage at the battery terminals of the charger, without a battery in it ?



I measured an even 4.50V :(
That's not good at all.

I have a couple of micro USB TP4056 boards but they're a bit too big to fit in this charger enclosure as-is, it's not really worth the effort anyways as this one only fits one size cell.

A lot have people have this charger (V7.1). I would assume there would be enough serious complaints by now to discontinue it for a newer or even an older version.

Your advertisement here
#33 (permalink)      3/5/2015 8:32:48 PM US Central   quote/reply + tips
JPBel
Member
  • JoinedAug 2014
  • Posts 3620
  • Reviews 80
  • Kudos1955
Schnarph wrote:

JPBel wrote:
What is the CV open voltage at the battery terminals of the charger, without a battery in it ?

I measured an even 4.50V :(
That's not good at all.


No it is not.

The good thing is that you can take a picture of the voltage without a battery in it as a proof, for returning or getting a complet refund.

#34 (permalink)      3/8/2015 1:09:19 AM US Central   quote/reply + tips
Ghost.of.Fast.Tech
Member
  • JoinedDec 2012
  • Posts 158
  • Reviews 1
  • Kudos104
Yorgen wrote:

@Ghost.of.Fasttech; do you have any suggestions on a replacement for the miller, that is; cheap, won't trickle charge, and preferably usb/micro usb input ???


Sorry, I've had some family issues that take some of my free time. As Hiko9 said, there are good options in xtar chargers. Hopefully Miller will redesign their charger soon (and actually test the design). It use to be a great option.

Please guys, do not take any advice from JPBel.
He continues to give wrong (and even dangerous) information on even basic aspects of li-ions & chargers. Unfortunately he has read enough to make it sound like he really should know what hes talking about. Not sure why he's getting the things he has read so wrong at times.
I'm afraid I don't have the time (or desire) to continue trying to correct him. I get the sense there would be some resistance, stubborness in understanding that he is mistaken on so many parts.

If you guys have any li-ion or charger questions I would encourage you to drop by BLF. HKJ test/review v7.1 Its a very friendly and helpful forum and HKJ will answer questions on his threads. You can also get good information at batteryuniversity.com. (li-ion charging page)

I am Not a FastTech staff member.
#35 (permalink)      3/8/2015 1:30:03 AM US Central   quote/reply + tips
JPBel
Member
  • JoinedAug 2014
  • Posts 3620
  • Reviews 80
  • Kudos1955
Ghost.of.Fast.Tech wrote:



Please guys, do not take any advice from JPBel.
He continues to give wrong (and even dangerous) information on even basic aspects of li-ions & chargers.


:D

I'd like to be proven wrong, that is the way i learn the most, by failing.
No hear say from other forum please, bring on the real scientific data, i really like to read that kind of stuff.

Mind you, what was suppose to be only a trickle charge problem has been proven by Schnarph to be an even bigger problem.

Please take care of your family issues first, i can wait.

#36 (permalink)      3/8/2015 1:38:23 AM US Central   quote/reply + tips
Felix1220
Member
  • JoinedSep 2013
  • Posts 510
  • Reviews 34
  • Kudos361
is there meanwhile a statement from the manufacturer somewhere?
#37 (permalink)      3/8/2015 1:51:54 AM US Central   quote/reply + tips
JPBel
Member
  • JoinedAug 2014
  • Posts 3620
  • Reviews 80
  • Kudos1955
Felix1220 wrote:

is there meanwhile a statement from the manufacturer somewhere?


If you have one and you measure more than 4.35V without a battery, stop using it.
No need of a manufacturer's statement to see if you have dangerous pos or not.

If you measure more than 4.35V, return it, or get a refund and trow it in the garbage where it belong.

#38 (permalink)      3/8/2015 3:00:43 AM US Central   quote/reply + tips
Felix1220
Member
  • JoinedSep 2013
  • Posts 510
  • Reviews 34
  • Kudos361
JPBel wrote:


If you have one and you measure more than 4.35V without a battery, stop using it.


you sure "without" battery?
also the ver. 7.0 i have shows 4.5V without battery, mean 7.0 is also affected?


Edited on 3/8/2015 at 3:01 AM. Reason:
#39 (permalink)      3/8/2015 3:12:46 AM US Central   quote/reply + tips
Felix1220
Member
  • JoinedSep 2013
  • Posts 510
  • Reviews 34
  • Kudos361
you can not measure without battery, I have tried now, every charger shows more then 4.2V

#40 (permalink)      3/8/2015 4:24:28 AM US Central   quote/reply + tips
JPBel
Member
  • JoinedAug 2014
  • Posts 3620
  • Reviews 80
  • Kudos1955
Ask Ghost.of.Fast.Tech what you should do with your soshine...
Or read what i have previously wrote and assess the risks yourself.

2 of these are tp-4056 based, the ego and the modified charger.
I did'nt took a picture of that modified charger pluged in main, but i know its voltage to be 4.2V







Edited on 3/8/2015 at 4:35 AM. Reason:
#41 (permalink)      3/8/2015 5:57:16 AM US Central   quote/reply + tips
Avatar
DragonUS
Member
  • JoinedNov 2013
  • Posts 682
  • Reviews 25
  • Kudos278
The last few posts of the Charge review forum with more user tests seems to indicate that, unless you are leaving it to charge for > 24 hrs, the 'over-charge' is more of a trickle. :Goes up to 4.24v max after 6 Hours..



Unlike being 'Cloupored', this should be ok for purchase if you normally plug it off after a couple of hours, considering there are 167 reviews here with no such complaints, averaging at 4.7/5 rating. But definitely, a revision is needed, as my trustfire charger never charge > 4.2V even if left for > 1/2 a day.