Emisar D4S review

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.

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.

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.

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 :wink:

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.

Under the wraps Keeppower 6000 is the same cell as Shockli 5500.

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 :slight_smile:

(Seriously of course you do not need both. Save your money. oh and don’t tell anyone I said that)

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

Thanks, I’ll remember that when I select some cells for the D4S

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?

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.

… and anything longer than a very short Awk program is usually best written in some other language. It’s only really good for one-liners these days.

awk is magic indeed

Maximum battery length that D4S will accept is 69mm, according to specs, if that helps.
The length of that KeepPower cell on that 18650.uk site is listed as 60.3mm, which is obviously wrong.

I still like Droid48 when I’m not at a computer for a quick calculation.

My 11C got me through my senior year of HS, and all of college. As an “accepted into grad school” gift to myself I bought a 48G, and I just barely used it enough to get accustomed to the UI.

Anyone still have a functioning Bomar Brain?

Those Casios with the miniature Nixie tube display were just great. Apart from battery life. They also had a couple of Easter-Eggs embedded too. If I could remember the keystrokes I’d tell you.

A proper HP has a proper red LED display, sadly my best one is bust, I think the Eprom just faded away. Perhaps because it was kept beside several, properly enclosed, radiation sources :person_facepalming:

Something worth noting for those who assume that e.g. Flash memory is magically permanent, it’s really just a few (very few nowadays) electrons, captured in a few thousand, or hundred, molecules of SiO2. Amazing that it works at-all.

Nevertheless all my important devices have been upgraded to SSD (good ones) and the slow spinning rust is kept for cold storage.

Will your torches with microcontrollers still work in e.g. 20 or 30 years time ? Maybe, maybe not. I do have a few with purely analogue, discrete component drivers, which could be eternal, but I’ll probably be dead before I find out.