Nice work Robert. :+1: Good review on a promising looking charger. I really like that it has an internal resistance reading (as long as it’s reasonably accurate) and love that it has a finished charging timer. I can think of many times a “finished” timer would have been helpful.
Welcome Leo. Nice to see you commenting so quickly in response to your product. Keep that up and you’ll find a very good response here.
Hello J-Dub74
Thank you for your reply, yes, we will listen to your voice any time humbled, and waiting for your suggestion eagerly.
Thanks B&G
Leo
I got this charger from Sally
I did a first check on it reading the manual and test some nearly full cells
A full review will be posted soon
I am interested to do more tests with different cells and a dummy cell increasing the internal resistance with an external resistor, to see how it adjusts the charge, as there is no option to set the charge current manually
The charger claims to auto adjust the charge current in relation to the cells, I hope they got that implemented well for tiny cells like 10180
The new USB standard with 5/12V is nice implemented, even just adding a car adapter,
as I got no new USB wall supply with 12V, the hollow plug of the first 12V PSU I grabbed from my very old 4 slot NiMh charger fits perfectly
A normal 5V 2A USB charger cant deliver enough for both slots charging with 1.5A, will test that as well with some USB power supplies to see if the charger adjust the charge current even with a small wall adapeter below 2A
So far I can tell that the new internal resistance measurement is far more consistent than the C4 charger as it seems to do the readings over time and even them out, while the C4 just do one measurement when inserting the cell
The contact plate on positive side gets improved to have a larger area making contact to the cell, I was not the only one noticing some wrong resistance reading and voltage drop
A discharge functionality would have been nice, but it tracks the charging mAh on all slots which is definately better than the C4 with only one channel discharge test, which can take all night on a high Ah cell
For a 2 slot charger it is definately wider than some other models making the charge of 2 D cell or 32650 possible
These look very interesting. Where/when they be available for sale?
Hello Stefan Vendel
Thank you for your reply, yes, Sally is my colleague.
She will follow up with you, and hope for your review.
Thanks B&G
Leo
Hello
Thank you for your interested in, our website is www.miboxer.com
Or just write email to me:sales@miboxer.com
Thanks B&G
Miboxer
I think the C4 has been upgraded. Henrik will let us know soon. He’s got the C2 as well.
Not the C4, but I got the C2, but it will be some time before the review is ready.
Hello HKJ
Yes, my colleague Sally sent you C2 3000, and waiting for your review with many thanks
Thank you B&G
Leo
Ah, that’s too bad. Was really hoping to see you retest the C4 too. Sounded to me like he was sending you both.
Not yet, this time, we just sent C2 out, as C4 was still under development
RobertB thank you for your nice review.
Thank you,
I don’t know if this is any indication, but it charged a 14500 at 1.5A, same as an 18650. I don’t own any of those tiny flashlights, but don’t most of them have a built in micro usb charger? Anyone wanting to charge a 10180 would have to make a spacer for it anyway, since they aren’t long enough to fit.
Yikes! That’s way high for a 14500 and WAY too higher for cells smaller than that. Hi drain 18650 are fine there and it’s good for 26650 and the other big cells but I don’t charge 14500 cells above 0.5A personally.
I thought it was a little high for a 14500 too, but I was closely watching and the cell never got hot. Only slightly warm. The 14500 cell is a newer Efest 650mAh
Based on all I’ve ever read on the topic it is too high for smaller cells. A high drain Efest cell and even a Windyfire can take it I’m sure, but my understanding is that it’s hard on the cells and will shorten their lifespan. If it charges all 14500 cells at the same 1.5A rate I would not recommend using it on smaller than 18650. Maybe Leo can chime in on the smart technology being used here. It may need some tuning. If there is an argument against my thinking here I’d like to hear it.
Thats what I would have thought as well. Was also under the impression, as long as the cell doesn’t get hot it shouldn’t be a problem. Maybe MiBoxer is talking about sensing NiMH type cells. It does automatically lower the charge current considerably for those.
I will discharge the same 14500 again and try and chart the curve.
The charger changes the charge current relatively to the cells internal resistance
So high drain unprotected cells will have too high charge currents
I charged here 7 years old 14430 680mAh recycled from an old camera battery pack
they started on 0.2A,
when the cells got more voltage the internal resistance dropped
before the CV started the one cell had 0.5A and the other 0.6A as their internal resistance got lower
The thing that I dont like is that at some point the charger shows an estimated capacity of the cell instead the charged capacity
both those cells were estimated at 1.5Ah but only got 590 and 630mAh charged
for 18650 the 1.5A are fine
I am doing more charges with different cells and do a time lapse for them, so my review takes longer till I can publish it
I dont like the battery revival for overcharged cells
I had from those old camera battery pulls one 2.13v and one 0.47V batteries
They started to charge on 0.1A
I could see how the charger tried to revive em going up to 0.3A and I aborted the test at this point
I agree,
1000mAh is TOO high 1500mAh is wayyy too high!
What I have been told is that IMR 10440, IMR 16340 and IMR 14500 should not be charged higher than 500mAh. I would think the same for protected cells.
A lot of people[incuding myself] would charge a IMR10440 @ 300mAh. My Opus has 200/300/500/700/1000 and 1500/2000 for slots 1 and 4
I had a Fenix ARE-C2+ for a few days and sent it back. The specs. claimed it charged everything @ 1amp. Yet they Approved it for ALL cells!
I emailed HQ in China and they tried to tell me that it ADJUSTS the current according to the battery/size. NOT!! I watched the charge cycles and it was a constant 1AMP except for when the battery first went in and at the end of the charge.