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Do not worry at all that you ordered D4 because you will buy D4S and many other flashlights anyway
D4 is actually good for edc and many 18650 are easily available for that light. $35 is even better price…
D4s is big step, bigger, brighter, aux led, and improved throw…
I got impatient, so I ended up ordering from Richard instead.
The HP48 calculator series was particularly interesting. In addition to the usual RPN stuff, the visual graphing stuff, and the symbolic formula manipulation, what made it really special was that it had a hierarchic filesystem. Users could store and organize arbitrary files, create their own library of functions and scripts, even create entirely new software for it to add applications or completely change how the calculator worked. And it had an active community building and sharing neat new things for it.
The main drawbacks were that it was fairly slow and connecting it to a computer was inconvenient. It was no worse about these things than other products at the time, but it sure could have benefited from a faster processor and a USB port.
I need to get some 26650s for the incoming D4S, ideally bought in the UK
I cannot find a UK seller for the LiitoKala 5000mAh 26650 cell (I don’t count un-recommended sellers from e-bay or amazon), but I can find UK sites I would be willing to buy 26650s from, for:
ShockLI 3500mAh 30A/60A
ShockLi 4300mAh 40A
AWT 4500mAh 20A / 75A
Efest 4200mAh 35A/50A
iJoy 4200mAh 40A
I understand the mAh (bigger is better, if all else is equal I believe)
But I don’t understand the Amp requirement for a D4S, and the description for the above cells (e.g. (20A/ 75A)
Would anyone be able to recommend some cells? I presume I’m going for unprotected flat tops.
I need to get some 26650s for the incoming D4S, ideally bought in the UK
I cannot find a UK seller for the LiitoKala 5000mAh 26650 cell (I don’t count un-recommended sellers from e-bay or amazon), but I can find UK sites I would be willing to buy 26650s from, for:
ShockLI 3500mAh 30A/60A
ShockLi 4300mAh 40A
AWT 4500mAh 20A / 75A
Efest 4200mAh 35A/50A
iJoy 4200mAh 40AI understand the mAh (bigger is better, if all else is equal I believe)
But I don’t understand the Amp requirement for a D4S, and the description for the above cells (e.g. (20A/ 75A)Would anyone be able to recommend some cells? I presume I’m going for unprotected flat tops.
Does nkon ship to UK? If so:
https://eu.nkon.nl/rechargeable/26650/ijoy-26650-4200mah-40a.html
That iJoy cell supposedly can deliver lots of current, which is what you want for your D4S light.
FWIW, even with the D4S’s increased thermal mass, turbo is still meant for relatively brief use. Higher-mAh cells work better at the lower, saner levels where the light will most likely spend most of its time. It can, for example, make the difference between 12 hours of runtime and 16 hours of runtime.
FWIW, even with the D4S’s increased thermal mass, turbo is still meant for relatively brief use. Higher-mAh cells work better at the lower, saner levels where the light will most likely spend most of its time. It can, for example, make the difference between 12 hours of runtime and 16 hours of runtime.
From that standpoint, would you say a Shockli 5500 would be a good cell to use?
Probably the best one to use, maybe the Golisi would perform a little better but it’d be tough to see the difference.
I need to get some 26650s for the incoming D4S, ideally bought in the UK
I cannot find a UK seller for the LiitoKala 5000mAh 26650 cell (I don’t count un-recommended sellers from e-bay or amazon), but I can find UK sites I would be willing to buy 26650s from, for:
ShockLI 3500mAh 30A/60A
ShockLi 4300mAh 40A
AWT 4500mAh 20A / 75A
Efest 4200mAh 35A/50A
iJoy 4200mAh 40AI understand the mAh (bigger is better, if all else is equal I believe)
But I don’t understand the Amp requirement for a D4S, and the description for the above cells (e.g. (20A/ 75A)Would anyone be able to recommend some cells? I presume I’m going for unprotected flat tops.
This is not a recommendation, just a heads-up about a potential UK supplier who has already posted on here, offering a 10% discount for BLF members.
As promised in the other thread HERE suggesting batteries for 18650.co.uk here is a generous 10% discount code, valid site wide and on any new products. Just add your order to the basket and use discount BLF10 for the 10% discount, I believe it will continue indefinitely. 18650 UK sell many batteries, charger, wraps etc and will be working on adding some of the batteries in the near future - they also offer free UK shipping! Thanks for the support, and thanks to Ben from 18650.co.uk for the d…
Offering e.g. a Keepower 6000mAh cell, protected to 30A peak, 20A continuous, which should be plenty.
https://18650.uk/product/keepower-26650-6000mah
Keepower are normally pretty decent. I’ve not heard about this 6000 mAh version before, never-mind the protection circuitry which I would usually avoid, but it might be worth a look.
I also made my own RPN-based calculator, for use on my Linux PDA. I never got around to giving it functions for graphing or symbolic algebra, but it was still a handy thing to have around for more basic functions.
You might like RealCalc, if you have an Android device. Well worth paying for the “Plus” version, once you have evaluated it for free.
The skins are well done too.
https://www.quartic-software.co.uk
Probably not enough digits though to suit your idea of basic performance
You might like RealCalc, if you have an Android device.
I installed RealCalc and a few others back in 2011 or 2012, but I haven’t used any of them in years. Mostly I just use python’s CLI as a calculator now. Anything without a programming language built in hardly seems worthwhile any more.
Pm sent.
alchemi:I need to get some 26650s for the incoming D4S, ideally bought in the UK
I cannot find a UK seller for the LiitoKala 5000mAh 26650 cell (I don’t count un-recommended sellers from e-bay or amazon), but I can find UK sites I would be willing to buy 26650s from, for:
ShockLI 3500mAh 30A/60A
ShockLi 4300mAh 40A
AWT 4500mAh 20A / 75A
Efest 4200mAh 35A/50A
iJoy 4200mAh 40AI understand the mAh (bigger is better, if all else is equal I believe)
But I don’t understand the Amp requirement for a D4S, and the description for the above cells (e.g. (20A/ 75A)Would anyone be able to recommend some cells? I presume I’m going for unprotected flat tops.
This is not a recommendation, just a heads-up about a potential UK supplier who has already posted on here, offering a 10% discount for BLF members.
18650.co.uk BLF Members 10% Discount
Offering e.g. a Keepower 6000mAh cell, protected to 30A peak, 20A continuous, which should be plenty.
https://18650.uk/product/keepower-26650-6000mah
Keepower are normally pretty decent. I’ve not heard about this 6000 mAh version before, never-mind the protection circuitry which I would usually avoid, but it might be worth a look.
Under the wraps Keeppower 6000 is the same cell as Shockli 5500.
. Just discovered this D4S and regret that I didn’t get that instead of the D4… Is it a big difference so I need both? Might be the wrong place to ask such a question
The D4S is bigger. That means longer run times and a somewhat longer time on Turbo before the light ramps down. It has the aux lights which are both cool and useful.
Most of all, it comes in green. Green is the best colour for a flashlight ever.
You need both. Better order that green one now before they are out of stock
(Seriously of course you do not need both. Save your money. oh and don’t tell anyone I said that)
I installed RealCalc and a few others back in 2011 or 2012, but I haven’t used any of them in years. Mostly I just use python’s CLI as a calculator now. Anything without a programming language built in hardly seems worthwhile any more.
I tried a couple of HP simulators on my phone and quickly deleted them. I either use my 11C, dc or write a program in java or awk.
dc is scriptable and even has conditional execution. It is also possible to do silly things like call dc from an awk script.
You folks absolutely amaze me. I have no idea what you are talking about but I enjoy the conversation
FWIW, even with the D4S’s increased thermal mass, turbo is still meant for relatively brief use. Higher-mAh cells work better at the lower, saner levels where the light will most likely spend most of its time. It can, for example, make the difference between 12 hours of runtime and 16 hours of runtime.
Thanks, I’ll remember that when I select some cells for the D4S
Tom Tom: alchemi:I need to get some 26650s for the incoming D4S, ideally bought in the UK
I cannot find a UK seller for the LiitoKala 5000mAh 26650 cell (I don’t count un-recommended sellers from e-bay or amazon), but I can find UK sites I would be willing to buy 26650s from, for:
ShockLI 3500mAh 30A/60A
ShockLi 4300mAh 40A
AWT 4500mAh 20A / 75A
Efest 4200mAh 35A/50A
iJoy 4200mAh 40AI understand the mAh (bigger is better, if all else is equal I believe)
But I don’t understand the Amp requirement for a D4S, and the description for the above cells (e.g. (20A/ 75A)Would anyone be able to recommend some cells? I presume I’m going for unprotected flat tops.
This is not a recommendation, just a heads-up about a potential UK supplier who has already posted on here, offering a 10% discount for BLF members.
18650.co.uk BLF Members 10% Discount
Offering e.g. a Keepower 6000mAh cell, protected to 30A peak, 20A continuous, which should be plenty.
https://18650.uk/product/keepower-26650-6000mah
Keepower are normally pretty decent. I’ve not heard about this 6000 mAh version before, never-mind the protection circuitry which I would usually avoid, but it might be worth a look.
Under the wraps Keeppower 6000 is the same cell as Shockli 5500.
That site was on my list of places to buy from, the others being Ecolux, Torchy (battery boy), and NKON.
The KeepPower are protected —- is the D4S like the D4, where protected cells are too long?
Wouldn’t max power also trip the protection circuit?
You folks absolutely amaze me. I have no idea what you are talking about but I enjoy the conversation
Awk is an ancient programming language created for processing text files. A very short awk program can do some tasks that would take pages in C or Java.