Maglight makes LED flashlights now. The one that I just threw away was an LED, mini maglight that ran on 2 AAs that was great for little things. Mostly, I use an LED headlight that I've got, but occasionally, something a big bigger is nice.

I know there are lots of plug-in rechargables, but I'm not sure what their battery source is. I would think someone somewhere must be making one like that.

Outlite A100, uses either a single 18650 rechargeable cell or your can use the AAA adapter.

https://www.amazon.com/Handheld-Flashlight-Rechargeable-Included-Adjustable/dp/B00VZT2WP6/ref=sr_1_2?s=instant-video&ie=UTF8&qid=1490041075&sr=8-2&keywords=rechargeable+flashlight

I have had batteries leak in all kinds of devices. A gas powered r/c aircraft, radios, and yes flash lights too. I use a quick fix should a toxic melt down occur, I clean it off with wd-40 and steel wool, even medium grit sand paper can help out in a pinch. Now I know better.http://forums.pelicanparts.com/uploa...1490069336.jpg
;)

The lithium ion batteries do not use acid for the electrolyte.

Eneloop rechargeables instead of crappy alkaline single use batteries. These are good for up to 2100 charge cycles and I have never seen one fail and damage a light or appliance.

https://www.thebatterysupplier.com/products/newest-version-panasonic-eneloop-4rd-generation-16-pack-aa-nimh-pre-charged-rechargeable-batteries-free-battery-holder-rechargeable-2100-times.html?gclid=CLWQuaKB6NICFYlrfgodDWQIqg

Eneloop are NiMH, which have a lot lower capacity than Alkaline, or Lithium rechargeable batteries. The electrolyte is NaOH, so if they rupture, they will cause corrosion.

I think there are a lot of misunderstandings about rechargeables. In my camera gear the Eneloop lasted much longer (more shots per use) than alkaline. If they ever failed, there would be a possibility of corrosion, they just don't fail. I have seen 50 alkaline batteries fail, damaging the flashlight, strobe, or camera. In 5 years with Eneloop I have seen zero failures. Nearly all those batteries are still in service too as opposed to the one-use throwaways.

Battery Myths vs Battery Facts

Put a condom on them. Make sure it's the thin type.

Mine are way too big for that...

And I'd guess that you'd have to poke a hole in the end.

My dad once told me if you want a flashlight to last never leave batteries in it. He would tape them to the outside in a plastic bag where if they did leak it wasn't a problem.