I’m going crazy with the choice of batteries.
I have ordered an S21A that uses 21700 and an S11 that uses 26650 both can use 18650.
What would happen if I use the 18650 in both?
I have many recycled laptop batteries in good condition.
Thank you.
Will happen unused space inside host, nothing more.
Ahhh perfect!
So I take advantage of the batteries that I have 18650 and I have a spare one, I thought that the flashlight would illuminate less.
I’m new to this world of flashlights and I’m catching up thanks to the forum.
Thanks
21700 and 26650 cells can have higher capacities than the highest capacity 18650. For example, the S21A only draws 6 Amps so there would be no downside to using a Samsung 50e with 5000mah capacity. The highest capacity 18650 that I know of is 3500mah
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Yeah, maybe not the full power, I have 2800 LG batteries and Samsung with maximum discharges of over 4000 but would be consumed fast.
Even buying batteries 21700, it’ll be my spare time.
But the flashlights are occasionally used to walk out on night hiking with my kids and their cousins have never run out of battery is more for fun.
Thanks. Good to know a 21700 could be 4800 or 5000 with a 1.5C discharge or much longer the duration will be longer and the battery in its normal state would already give the 5A without forcing it.
Now you have to know what I choose so I don’t have to buy 3 types of batteries, if I choose one that uses the same as the S21A would be good so I would just buy 21700
The question was whether you did use 18650 and the result if it was less duration or less lighting.
There aren’t like 27 different battery types you have to memorize, though. There are only four of the “standard” li-ion sizes, so it’s not confusing. They are:
14500
18650
21700
26650
And most chargers can charge all four types, so you only need a single charger to cover them all. Larger and smaller batteries do exist of course, but they’re less common and well-known.
That being said, I am a fan of the 26800, which is less popular than those four, mostly because it hasn’t been around for very long. I find that the 26800 lights are better for me ergonomically because the body has to be thicker and longer to accommodate the larger cell, plus the runtimes are great as a bonus.
I know them all, I meant that I have a S2+18650 I have many are more than more use in my electronic projects.
And on the way a S21A 21700.
I want a more powerful flashlight and if it also uses the same battery as the other two as the 21700 as I only use one of the flashlight at a time I don’t have to buy several bars only 21700 as 18650 I have.
I don’t know if I explain.
But it’s not a thing if I choose a model with another battery I buy it and fixed.
Sorry use translater.
I think you will get less output with those batteries because they are only rated for 4 Amps and the S21A can pull 6 Amps.
I’m not a fan of using 21700 cells in 26650 lights, primarily due to the extra length/ spring compression. Obviously it varies depending on the model. After a bad experience with my EA02 using a Samsung 50E, I stick with 18650 GA’s. Significant capacity difference, but I don’t run that light enough for it to matter. You should be fine with your laptop pulls. Might want to look around for some generic poly spacers to reduce the rattle of the thinner cells, or fashion something out of a cut down toilet paper/paper towel tube.
I have many recycled laptops in very good condition, good and real brands.
As the one that is on the way is an S21A that uses 21700 I will try them.
The 28650 was in case I decide on the S11 as a more powerful one or an M21B that also has 21700 and I wouldn’t have that problem, I would try and if I lose power then I bought them.
Since it hasn’t arrived, I don’t know what would happen, that’s why I was asking.
Thanks!
The biggest concern with using 18650 in a 21700 light is the shorter cell length. As the S21A has a solid contact on the driver (as opposed to a spring), there’s increased potential for impact induced mode level changes due to the positive terminal losing connection during handling. Just something to be aware of.
Enjoy your new lights…that’s all that matters.
Thanks!!!
I am electronic, I solve that without any problem, it is not necessary to buy a new pcb with a spring.
18650 salvage laptop batteries are nort good at all. They’re old with higher internal resistance which also limit maximum current which they can deliver. Also new one have low discharge current. Maybe they are good enough for some low current LED in host like Convoy S2+. If you want to use any 18650 there are many modern high capacity cells with rated 10A current. For me minimum discharge current of 18650 cell in flashlight must be around 8A. Laptop batteries are good only for something like power bank where you can connect them in parallel and not for single usage in flashlights. Modern lights are to powerful for them.
The FT03 is the best execution of multi cells used in the same light. It takes 18650, 21700, and 26650. They provide the sleeves for all three cells and they work perfectly. Tight fit.
This makes for a truly versatile light.
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18350 and 16340 are pretty common too.
Maybe more common that 26650s these days. Everything has an 18350 tube as an option
That LG battery you linked to above was released in 2009 and discontinued soon after. If you still have any, those are real old batteries. And it’s a 4.3V so it’s not like it’s had an easy life. I wouldn’t use those. I have several 10+ year old batteries that I keep kind of just as a fascination, like to put in a museum one day maybe, but I don’t use them in a flashlight.
I have only put one model, the first one I take out of the security guard, I keep them protected.
I am a technician and new laptops arrive, I have Sanyo Samsung LG, some with a strange name I do not remember and a high discharge of about 10A.
I have built a power bank with a lot of power thanks to those batteries and before meeting the group I bought from AliExpress and the weight was horrible, the quality with those of laptops is abysmal.
It is true that some are about 120mohn older but others do not exceed 60 or 70.
In flashlights they last me a long time without charging them.
But I have not tried them on this type of flashlights yet.
That is why I wanted to decide whether to use the 18650 or if I am going to buy new ones that are only the few types, that is, focus on 18650 and for example on the 21700 since I will not use two flashlights at the same time, I would have batteries for various types of flashlights, 18650 or 21700.
If in the end I decide on the S11 I would have to buy three types of batteries for the S2+ 18650 for the S21A 21700 and for the S11 26650.
It’s not a problem but since I would only use one at a time with a couple of batteries I have all powered.
I’ll give you the characteristics of another, I don’t know if it’s old, but it’s more powerful in download and better in capacity.
I have many CGRs from various downloads that are not very good but they work very well and seem heavier.
It’s a shame not to take advantage of them.
In the S2+ it works very well for me, I choose the ones with lower resistance and higher capacity but not with high discharge since I think this model does not need it.
correct me if i’m wrong.
Maybe they don’t work well in the S21A and I’ll look for a good one, but before meeting the group, the ones I had bought were very bad with the ones I already have and I stopped buying.
I use them in my electronic projects and now in flashlights.
Thank you.
It’s very big!!!
Thanks for the information.
Another one that I have looked at right now, I have many and they are not old, this is from 2010 but the previous one I think was more modern, I did not see the date.
For the S2+ it would be fine, I will dedicate myself to seeing all of them and I will mark them since I only did the resistance test to rule out but not the capacity test. I have yet to buy a charger.
I use a 50w 6A Turnigy with Cheali firmware as well as various circuits and diy sources for charging.
And I hate mounting the shed of cables in the loads but I hesitate between the Opus 3100 and the Lii500, the latter seems to be of better construction quality and it costs me half.
I don’t care about the price but the quality, look at the MC3000 but the occasional charges are not worth the expense. This month I have only charged three batteries, since I put them in power banks and the others are for the flashlights that I bought and charged to test the S2+ and I will not charge it again until the next time I use it, which will be in the summer.
