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 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.
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)
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.
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.
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.
There was a bug on the first batch of Convoy’s new drivers which, after calculating the scale of the chips involved, worked out to having a few hundred atoms flipped the wrong way. Basically, the SRAM decays to its default state when power is removed, and that state depends on the orientation of the atoms in the SRAM memory cells. If a few specific bits had enough atoms rotated in the less-popular direction, it would decay to a value which caused problems.
So people returned products for refund or replacement, and justifiably so. Because, totally at random, if they were unlucky enough to have a few hundred atoms out of place, it didn’t work right.
As soon as we discovered the issue, I updated the code to take a larger sample, which dramatically reduces the chance of that happening. But due to the nature of these things, the chance is still non-zero.