In both of these scenarios you would see some sparks (sorry for my understatement) before cell damage would occur. I’m more afraid of second or third degree burns on hands and face, causing a domestic or industrial fire, and/or eye damage. Or avoiding any of those, publicly having to admit shitting oneself. Pardon my French on a family forum like this, but this is serious stuff. I’m speaking out of experience and it’s my wish others will not have to. 
Dr. Jones has bump protection working really good in his h17f driver. I’m not sure how he implemented it, but it can distinguishe whether loss of power was a bump or an intentional button press. A slam down on the table will be ignored.
The last time I was home, I showed my wife the Q8. She said, “Wow, that’s a NICE flashlight.”
As I type this, I’m in DC for business. She is in San Diego. We’re on the phone and a circuit breaker trips. As she’s heading outside to reset the breaker (with the L6) she says, “I need the soda can light.”
Across the country, I am grinning ear to ear.
I love my wife!
Quality cells like those Samsungs wont burn and explode
They got still electro-mechanical safeties against serious overcurrent or vent, which will separate the Anode from the positive contact
Those cell explosions usually come from overdischarge or other abuse damaging the separator foil inside the cell or overcharge
Yeah I ordered an $0,88 plastic caliper to measure cells or things that scratch easy. Good Quality 150 mm 6” Gray Plastic Mini Caliper Vernier Gauge Micrometer
http://s.aliexpress.com/zQrEFJB3
(from AliExpress Android)
Even cheaper now
Smittyjojo, yes it I’d frustrating, order and forget is rrally best for blood pressure.
Lots have been send out, too late for a V2 marking on box.
Yes, I probably shouldn’t understate either. Don’t short a car battery. Those things are often rated for 500+ Amps on a cold day, and in one test of a relatively small battery they measured 1700 A with a dead short. A larger battery sized for a truck could probably put out thousands of Amps. At 12V, that means tens of thousands of Watts, concentrated into a relatively small area, which can cause serious damage or even death.
I had a car battery explode on me once when I turned the ignition. Had the bonnet open (hood for those using corrupted English…) and bits of it landed a good 100 yards away. Quite spectacular but potentially bad for your underwear.
The simplicity makes it an awsome idea.
I love extra features we have these days but, when ity becomes so complex you need a tutorial.... that's a bit much.
I instantly thought of the shorting aspect of using metal calipers also when I saw the picture, but I just figured that the set up seen was just for the sake of the photo. Metal calipers could be used with an insulating spacer and then just subtract the thickness of the insulator from the measurement. The insulator could be as simple as a piece of card stock.
thanks the miller, i just ordered the ali plastic calipers. 
ken
Seems like you can use wax paper / baking paper as insulator too. I use it a lot in my micro to collect the fat and gravy when baking raw food.
GREAT! Even more tables.
Love it
Dale out of all of your chargers, which is your go to? Or does it change depending on the cell?
Wow all this talk about my picture using metal calipers. I’ll admit I almost measured the cell bare but then realized why that would be bad and put a small piece of paper on one side. The picture you see is after measurement with the caliper resting on the table (not reaching the positive terminal)
Apart from the safety issues, a fat spark could ruin the precision ground surface of the callipers, spoiling them for precision use. Put a piece of e.g Kapton tape, or ordinary Sellotape on one end first.
And do treat car batteries with respect, inside they contain an explosive atmosphere of hydrogen and oxygen. If the battery has been over-charged and “boiled” the electrolyte (acid) heavily, there may little (but highly concentrated) acid left, and most of the volume filled with explosive gas. Abuse one with e.g. a short and if an internal spark happens e.g. when a bit of the lead inside melts, or an external spark ignites lingering hydrogen, kaboom ! A substantial explosion, happened to a neighbour, car bonnet blown off and conc. sulphuric acid sprayed everywhere. Before attaching leads, ventilate thoroughly in case there is any hydrogen lingering around.
Modern “sealed” ones are safer, they have a catalyst inside to recombine the H2 and O2 to water, but it is a slow process which does not keep up with heavy charging currents, e.g. after a battery has run low, then been recharged on a drive by the full output of the alternator.
Hydrogen has one of the widest range of flammability limits, so is an extremely dangerous gas to have lingering around. And when generated by electrolysis inside a lead-acid battery the perfect explosive mixture is produced.
Foldable Q8 Diffuser made by wax paper.
> inside a lead-acid battery the perfect explosive
Capable of throwing sulfuric acid all over the area, too.
It carries a “do not muck with this” warning
Talk about the B in BLF
Anyone remember where to find the post where a 3d printed lantern diffuser was featured, with a link to the program? A friend of mine just got a printer today and I can’t seem to find the post with thread searches.
Is there a post with the links of the protos’ reviews ? Just curious
thanks