by the way, all of Miboxer charger can charge 21700 with protected from now on.
the charging slot is 80mm can fit 21700 with protected batteries.
Thatās a nice feature. :+1:
BTW, neither of your posts above have pictures showing, for me at least.
Looks great. Does it detect the internal resistance to automatically set the charge current? Can it display the internal resistance like the Miboxer C2-3000?
I wouldnāt worry about 26650, I predict they will die out as 21700 becomes more popular.
Why would you think that? Are you under the impression that a 21700 can match a 26650? Far from it. The 21700 is simply a container size in between the 18650 and 26650. Thatās all.
The 21700 canāt match the 26650 capacity, but can deliver far and away more power. Iāve found this true in the Samsung 30T and iJoy 21700ās as compared to any 26650 Iāve tested, and thereās been quite a few.
But I for one will be using the 26650 for a long time, as well as the even larger 32650, as I have lights that do very well with these package sizes.
The MiBoxer C4-12 is a favorite charger of mine, I canāt see much use for less than 1A charge to 8 cells though so this new offering has no appeal to me.
The gap is closing and 21700 are being developed at breakneck speed compared to 26650.
The gap is not closing. Look again. Capacity of the 26650 is also growing. The 21700 is just a bigger version of the 18650. The battery chemistry and energy density is pretty much the same as an 18650. Development actually seems slow.
The reason the 18650 and 21700 have such high capacity for their physical size is because the big battery companies make them with their special mixes. This gives them high energy density. Unfortunately only smaller battery companies make the 26650. Their chemical mixes and energy density are not quite as good, but they are getting closer to the big companies all the time.
When you see the Samsung 48G with 4800mAh and a Littokala 26650 with 5000mah you canāt just assume they are the same. The 48G is only rated at 8A to 10A continous. The Littokala is rated at 20A continous. If you want 20A continous from a 21700 you have to move to a lower capacity version. I think the Samsung 40T 4000mah can do 15A continous. This is close, but you have to go another step down in capacity to the 30T 3000mah to reach 20A continous (The 30T can actually do 30A continous, btw). Maybe if Samsung did a chemical mix that gave 3500mah capacity it could match the Liitokala 26650 in continous output.
So you see, if you need 20A continous, you can use a 5000mah 26650 or a 3500mah 21700. There is quite a gap in their capacities.
If you need 15A continous, a Samsung 40T 4000mah can be used. In 26650 there is the 5000mah Liitokala or the 5500mah Shockli. I donāt think the 6000mah KeepPower has been tested, but surely it can do 15A continous. So you still have a decent gap, 4000mah to 5500mah.
Only if you need 10A or less continous output do the 21700 high capacity cells start to equal the power of the 26650. At these lower power levels is where we need the big battery companies like Samsung, Sony, LG and Sanyo/Panasonic do make a high capacity 26650. If they put their same high energy density mix in a 26650 container we would see 7000mah 26650.
At the moment, anything needing between 10A to 20A continous is advantage 26650.
Edit: Even at the 10A range, the 26650 has a lot of advantages such as less voltage sag plus a bit more capacity as well.
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Firstly, apologies for hijacking the original thread on to a different subject. Iāll finish my contribution to this diversion by saying I have never tested a 26650 battery that can maintain capacity up to 50A continuous current, which the Samsung 21700 30T and 18650 20S manage, and both even manage half decent results at 60A continuous.
I think any further comments on this subject should be on a new thread.
All things do not always fit into apples to apples comparisons.
When I built my triple high output light I did so with the intention of using 20700 cells. Then those were difficult to find so I rebuilt it to take 26650ās. Then it was difficult to find a pair that would deliver. When I found the iJoy 21700ās the 26650 was left far behind in terms of absolute power. The Samsung 30T even blows away the iJoy cells. Capacity can be nice, but power is the brute force champion in the lights I build and nothing performs like the Samsung 30T. Nothing even comes close.
I know itās not every day we have a light that wants 30A or more, but in this lights case, it went from 36A on the iJoyās to 48.8A on the 30Tās. Shockli 5500mAh 26650ās canāt compete.
Sure, itās nice when you show us what you want us to see in the charts from HKJ, but if you want to push the Luminus CBT-140, SST-90, SBT-70, or the new CFT-90, then youāre gonna need something the Shockli canāt deliver. Power. Pure unadulterated raw power. Run times be danged. We donāt pay $50-$115 per emitter to run em on the conservative side.
And this chart only goes up to 30A, the difference is assuredly more exaggerated at 40A or 50Aā¦
These kinds of lights hit a cell very hard, we get deep discharges quite fast, so the ability to re-charge at 3A like the C4-12ā¦ to 4 cells at a timeā¦ is epic!
Taking both these cells fresh off the C4-12 charger just moments agoā¦the 30T allows 45.1A draw for 19,734 lumens in this light. The Shockliās allow 25.4A for 12,592.5 lumens. Cell choice makes a 7,000 lumen difference. Seems to me the argument is proven by the very cells in question.
Sorry, I thought we were talking about the capacity of the 21700 getting close to the 26650.
Maybe some were Jason, you know me, all about the powah! 
lol Sorry if I sidestepped that.
I was hoping, when I heard about this 8 bay charger, that it would be more capable of higher inputs to get a couple of sets of 4 charged up faster. Like for the GT, for example. But it was said up above that it would do .8A to 8 cells, thatās pretty slow when using high capacity 3400 or 3500 mAh cells for the GT, will take 4-5 hours. I realize it would be a pretty stout chore to do 16A for a 2A rate, but I was hopingā¦.
To answer my own question, I just checked the Mi Boxer website and it does measure and display internal resistance. However it also states āsingle channel charging up to 1.5Aā whereas above it states that it will charge 2 channels ar 2A. Which is correct?
Post number 1 saysā¦
āMiboxer C8 coming soon
Input: 12V*5A
Output: 4.2V,4.35V,3.6V,1.48V.
Current: 8*1.0A, 4*1.5A, 2*2Aā
Then later in post number 15 MiBoxer statesā¦
āMiboxer C8 can charge 8 pcs 21700 Simultaneously
1.5A*4
0.8A*8ā
So itās unclear exactly what the charging rate isā¦
Itās been changed to .8a x 8.
Let us know how it works out.
The maximum charge current varies depending how many batteries are being charged: 1.5A with 4 batteries,1.2A with 5 batteries, 1A with 6 batteries, 0.85A with 7 batteries and 0.8A with 8 batteries.
Here is a nice review of the C8 charger from HKJ
https://lygte-info.dk/review/Review%20Charger%20Miboxer%20C8%20Smart%20charger%20UK.html
Not too sure about this one. Measures resistance thatās out of the ball park resulting in low current.
The automatic charge rate selection has never been real accurate. Itās always best to manually set it just like you would on other brands of chargers.
On this model it looks like you can hold down the slot button and select the charge rate for all eight slots. You could select 1 amp for all slots (good for the 4 x 18650) and then come back and adjust the three smaller batteries rates.
I like this blue color LCD screen a lot more than the orange one that was shown earlier.