Trying to pet something I shouldn't.
It's a separate piece to carry, but a diffuser is one solution to that.
The Loop Gear SK05 Pro is an interesting option for $120, but the UI isn't simple and there's a lot of toy in its feature set. I suggest the Nichia LEDs for their superior color rendering, but I think this probably isn't what you're looking for.
Several chargers in the $20-40 price range measure the battery's internal resistance and pick a reasonable charge current based on that. Many of those have an override for charge current but it would be convenient to have the option of just fast or slow based on that measurement.
The rule still holds. Charging fast is harder on batteries. It's true for phone batteries too, so all these new phones with three-digit charging wattage are likely to wear out quickly.
I have some devices where voltage is important and they will not run on 1.35 NiMH voltage but they will run on 1.6 Alkaline voltage.
It's presumably not your doing, but I have to note that's a terrible design. Under light load, an alkaline hasn't even expended a third of its energy by the time it hits 1.35V (example test result).
Good flashlights usually don't have adjustable beams. Zoom mechanisms are bulky, optically inefficient, and aren't very durable or waterproof.
The Acebeam EC35 II or T36 would be exactly what you're looking for if you could get one. Unfortunately both are discontinued. If the Acebeam L16 2.0 isn't too fat to put in your pocket in a pinch, that might work.
AC units do not typically pull in outside air.
Heat is bad, but the battery could be positioned below the oven. Disposable would be cheaper.
The burner valves operate mechanically. It has an additional shutoff valve that closes when there's no electrical power. A battery backup for the igniters would be a great feature though - a Li-ion battery stored at half charge would last pretty much forever.
I encountered an infuriating example of the opposite a couple years ago: a gas stove that wouldn't work without electricity.
A gas stove normally operates with a mechanical valve to control gas to each burner, and while modern ones have electronic igniters, it's possible to use a match or the like instead. These assholes went out of their way to add an electronic valve that shuts it off when there's no power. It's probably in the name of safety, but the scenario where someone leaves the valve open without igniting the gas is possible even with power by failing to engage the igniter correctly, and gas is smelly.
I should be able to use a gas stove when there's no electricity or the igniter is broken if I supply my own source of ignition.
For your example of a flashlight, consider one with USB charging. If the charging port or circuit fails, I should be able to easily take out the battery and charge it in another charger (Li-ion charging is pretty standardized). If the battery is dead but the USB port works, I should be able to use it as a USB-powered lamp.
I don't like it because:
- I want to look at the oil and smell it, not just check the level.
- I don't know the failure modes for the sensor, so I can't trust that the absence of a complaint from it means the oil level is correct.
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I've encountered a number of outlets in American airports that should be replaced due to wear. They have very little friction on the prongs after millions of uses.