Vent hole in bottom cap: false sense of security?

[NatureBoy]

If everyone would be using Li-Mn we probably wouldn't need to talk about vent holes in bottom caps.
I'm only using IMR these days but when you check the "batteries & chargers" section you'll see people are still using ICR too (more capacity). Not everyone's informed about the safety of batteries and every starter can buy a mod and put inside whatever's available. Hence the manufacturers should build in as much safety precautions as possible. I think it would be a good idea if they made the battery go in bottom first and having the battery's vent holes near the bottom cap of the unit.
I totally agree with you that the industry should make the difference between the different chemistries more clear.

That's the very reason I didn't purchase a 14250 mod. There is only one manufacturer that produces IMR 14250 batteries, and they outright refused to ship to the USA due to stiffer regulations.

Meanwhile, the person who makes the device insisted that li-ion batteries were safe to use in it, even after I explained I'd be using it with RDAs and micro coils.

Unfortunately, there are still a lot of uninformed people about the improper/proper use of batteries.

 

[yo han]

I like mine with the 5 volt NiMH batteries, or IMR in a pinch.

What do these look like? All I know are these 4-cell packs which wouldn't fit in a K100 even if you'd be using a sledgehammer

 

[VapieDan]

The purpose of a vent hole is to allow pressure to escape, somehow. The alternative is that you have a strong metal tube, where the only possibility of pressure release is through a drastic rupture (aka "Pipe Bomb"). Vent holes can make a dramatic failure better, but it's pretty much limited to reducing effects of the tube on what is already a disastrous event. It WILL get very hot. It WILL spew high-temperature flames and potentially dangerous fumes. A vented mod can still catch your house on fire. It's unlikely, however, to blow up like a grenade, sending shrapnel around the room. It might help limit fire damage, but that's just a side effect.

The lithium batteries are the dangerous part, and if they blow, that is scary. Vents are intended to prevent the mod from making it worse, and shouldn't be relied on to make it better.

Once the "Fire" has started it is too late to prevent damage. To me vent holes give you enough time to toss the thing. More than likely you will sustain some burns but better than a grenade going off. Since we are on this topic how come cell phones are not a big issue and little media attention? Go to YouTube and search cell phone explodes. Simple matter of cell phones are good. E-Cigs are bad. As you will see there is no bias in the media. Yah right. I personally feel the E-cig community is far more responsible and effective in disseminating information to the users than the cell phone industry.

 

[Stosh]

Quote Originally Posted by Stosh View Post
I like mine with the 5 volt NiMH batteries, or IMR in a pinch

.What do these look like? All I know are these 4-cell packs which wouldn't fit in a K100 even if you'd be using a sledgehammer

They are a 4 cell pack in the size and shape of an 18650, just a few mm shorter, fit fine.

 

[Ryedan]

Here is one example of the NiMH batteries. Keep in mind they are only 600 mAh and you need to keep the current draw reasonable. The feeling I get is no less than 2.0 ohms and 2.5 is probably better. Need a special charger and should not be undercharged or one of the cells inside can get low. But they may be safer than IMR Li-ion and they work quite well.

Did I get that right Stosh?

 

[yo han]

Interesting. I never knew these existed.

 

[Stosh]

Here is one example of the NiMH batteries. Keep in mind they are only 600 mAh and you need to keep the current draw reasonable. The feeling I get is no less than 2.0 ohms and 2.5 is probably better. Need a special charger and should not be undercharged or one of the cells inside can get low. But they may be safer than IMR Li-ion and they work quite well.

Did I get that right Stosh?

Interesting. I never knew these existed.

Those are the ones, they are about 5.2 volts on full charge, 4.8 volts nominal. They don't do extreme high current, so a 2-2.5Ω coil work best. You get higher wattage without lowering your coil to a near short circuit.

I've built some mods using 4 of the AA size NiMH or NiZn cells, very cheap, easy to build, and with a normal resistance coil a very warm vape.

 

[ILoveNorCal]

Those are the ones, they are about 5.2 volts on full charge, 4.8 volts nominal. They don't do extreme high current, so a 2-2.5Ω coil work best. You get higher wattage without lowering your coil to a near short circuit.

I've built some mods using 4 of the AA size NiMH or NiZn cells, very cheap, easy to build, and with a normal resistance coil a very warm vape.

What charger are you using with the NiMH batteries?

 

[Stosh]

What charger are you using with the NiMH batteries?

4.8 volt NiMH Battery Charger works well, just takes a bit longer time than LiIon.

Or go full fledged NiMN / NiZn http://www.e-cigarette-forum.com/forum/battery-mods/105465-now-puck-cheap-parts-easy.html#post1587798