[y7r4m]

It would be awesome if we were able to get more things besides vapes (and apparently some flashlights; I assume there are many niches where they are common) to use 18650 or even 21700 li-ion cells. I see most people I know buy AAs by the pallet and go through them regularly for their controllers, led lights, kids toys, etc.. and few I believe bother to dispose of them correctly.

Also, repeating your sentiment, for all the tech gadgets.. bluetooth speakers, I'm looking at you.. why not have replaceable batteries for those? There have to be enough vapers now that the knowledge of this type of battery as distinct from the old alkaline ones has passed into mainstream consciousness. This would be a huge selling feature for me.

The reasons I see are that it is because the rechargable li-ion are more dangerous and a fire hazard, but is this really true? As with most anything that can carry a risk if misused, I can find a few dozen instances where a vape battery went awry, but surely the benefits outweigh the concerns?

Edit: I do understand the irony of saying this on a post about when they do go boom.

[kube-system]

The market for the end product (and the risk aversion of the manufacturer) makes a difference.

Flashlight and vape enthusiasts are mostly adults who likely trend as all three of: older and more knowledgeable, more likely to take and accept risks, and more willing to pay a premium for the benefits of replaceable batteries... and the companies that make vapes and high-powered enthusiast flashlights are probably less worried about a customer suing them over a battery issue than a large toy manufacturer. If you're a vape company, you have bigger safety issues to worry about -- like the normal operation of your products :)

[joecool1029]

> and few I believe bother to dispose of them correctly.

There are no mercury alkalines anymore for general consumer use, those collection bins were removed from stores in the 90's and they can be disposed of with normal waste.

[Zak]

I actually have a Bluetooth speaker that takes a removable 18650. It was branded "Polaris V8", but I think it's a white label product that's no longer in production. It still works, and most other ten year old Bluetooth speakers probably don't.

I'm with you on the risk/benefit calculation. E-waste is bad, and the option to bring a spare battery makes a lot of products more useful. A Li-ion cell can be dangerous if mishandled, but less so than a jug of gasoline or larger power tools.

This can be considerably mitigated by sticking a protection circuit on the end of a cell, which makes it no more dangerous than the proprietary Li-ion batteries used in things like cameras.

[Clamchop]

I didn't know many were still buying alkaline AAs in large quantities. I've been using LSD NiMH AAs and AAAs for I think more than 15 years and haven't looked back. They seem to work with everything.

[homebrewer]

There's still lots of poorly produced electronics that treat NiMH that is within its normal operating voltage as being out of juice, and either nag you or shut down completely. My supposedly high quality Logitech mouse is one example (probably not buying anything from Logitech ever again, they're one of those brands that are coasting on their old credibility).

[Pxtl]

If it runs on two batteries in series and you're willing to take a risk, you can get a 3.7V 14500 battery and then a dumb fake straight wire battery in there. Gives you 1.85V per-slot instead of the normal 1.5, which might be too much for the device, but beats the pants out of the 1.2V you get from NiMH AAs.

I got 14500s for my Logitech F710 game controllers, and then drilled a hole in the battery compartment of the controller to make them plug-in chargeable. I've only just played with them a few times - no guarantee this is a long-term solution, but it seems to work well for now.

Note that this does mean you'll have a bin of things that look like AAs but might cause a fire or melt if you put them into the wrong thing that accepts AA batteries (like the just-a-wire-fake-batteries have allcaps warnings about never ever putting them into a charger).

[Zak]

It actually gives you 2.1V per slot because a fully charged standard Li-ion cell is 4.2V. This is also sketchy because it will likely over-discharge the cell below 2.5V if not monitored carefully. Over-discharge makes it dangerous to charge the cell again.

Actual protected 14500s will be too long in most devices meant for AA, but it's possible to find protected 14430 cells marked as "14500" from some flashlight brands like Acebeam and Skilhunt. Those are safe with regard to over-discharge, but the voltage of a fully charged cell might still damage devices not rated for it.

I'd rate this modification as risky and only suitable for people with significant battery expertise.

Edit: saw the other comment mentioning 14500s with USB ports. These will be protected against short circuit and over-discharge, and are actually based on 14430 cells.

[Pxtl]

Ah, thanks! Good to know I dodged that bullet by blind luck. I had picked up a couple of USB-port charged version of one of those old chubby non-rechargeable lithium batteries that were used in early LED flashlights (CR2 I think) to resurrect some old steel LED flashlights I found in a drawer, and got funny fantasies about doing other devices this way.

I saw some articles and ads for doing it using 3.1V LiFePO4 batteries but I couldn't find any of those with USB charge-ports... I guess your warnings are why you're supposed to use the 3.1V Li-phosphates for that. So I went with the 3.7V LiIon because I really wanted that port.

I guess I dodged a bullet. Thanks for the warning. I actually did systems engineering as an undergrad (though I just work in software) so that makes me a bit overconfident with electronics even though I don't know jack about battery chemistry besides the basic theory. I'll be more careful on research next time I undertake this kind of project.

[Zak]

It seems like you might be looking for "1.5V Li-ion AA", which is a 14430 with a buck converter stuck on the end.

I have pretty much the opposite preference regarding charging: I'd much rather swap in a charged spare and stick the drained battery in a slot charger than charge batteries inside devices. There's no waiting that way.

[Zak]

A device that won't work with NiMH due to voltage will also only use about a third of the energy in an alkaline. Poorly produced is an understatement.

My Logitech G604 works fine on NiMH. The calibration for reporting battery charge as a percentage is off, but it runs for months.

[ajolly]

As an aside, pretty much all the g604 is will end up with double click reliability issues or an inability to hold down the mouse button and drag. But you can easily replace the switches or there's vendors on eBay and AliExpress that I'll sell you a circuit board with the switches pre-soldered for replacement.

Logitech no longer makes the g604 :(

[Pxtl]

I have a g302 sitting in a drawer on my to-do list for similar double-clicky switches replacement.

[Zak]

I read that before I bought one. I have a screwdriver and a soldering iron.

[hn_acc1]

If you can replace the battery, they can't sell you a new one.

[BobbyTables2]

Bingo!