Funny thing:
As much flak as a cherry bomber gets, it actually has plenty of ventilation.
As much flak as a cherry bomber gets, it actually has plenty of ventilation.
Mech Mods with top venting holes?
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Le Petit Gros for all those crazy kids wanting to sub-ohm on a 18350....
Interestingly enough the inside of the tube is also machined with a "bulge" in the center, which looks like it would absorb a swelling battery as an additional precaution.
Interestingly enough the inside of the tube is also machined with a "bulge" in the center, which looks like it would absorb a swelling battery as an additional precaution.
The prax1s is top-vented.
Four top vents, can't autofire. It is pretty much always in my pocket.
Four top vents, can't autofire. It is pretty much always in my pocket.
MCV Overdose and Overdose v2.
As an aside, I have witnessed an HG2 vent from an authentic copper Raptor. Not mine. Cells were installed positive end up. Hot soot and flames exhausted out of the holes of the negative battery cap. It was a rather an amazing sight to behold. The mod is still in use today.
Unless the design expects the cells to be inverted with the positive postitioned down. Some of the latest tube mechs on the market are designed in such a fashion including but not limited to the Sub Ohm Innovations Legendary Subzero and the Kennedy Enterprises Roundhouse. The drawback is that the body of the tube becomes positive and any failure of the battery wrap against the body will result in a hard short. The benefit is that the cell will vent downwards away from the head. In fact, every single cloud competition I have ever attended has had its panel of competitors install their cells with the positive end down.
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The slotted button of the Roundhouse doubles as a not-so-subtle indication of how a cell should be oriented...
Location of the Roundhouse vent holes in relation to the following cells (L-R): HG2/30Q/HB6/25R/HB4...
Location of the Roundhouse vent holes in relation to the following cells (L-R): HG2/30Q/HB6/25R/HB4...
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True, I broke several bits trying too ventilate my SMPL. I was planning on making a slot on each side using the grinding disk on my Dremel, but I'm afraid of making a hash of it and destroying one of my favorite mods.
Make a jig to assist you; maybe practice on a clone first... it is one of the things they are for, right?
I tried with a grinding disk on my dremel, the disk disintegrated. I got annoyed and went in with a hacksaw. It now has some top venting, but looks like a dogs dinner. Note to self, don't mod when angry.
Ouch!, Those "fiber type" discs are fragile.I tried with a grinding disk on my dremel, the disk disintegrated. I got annoyed and went in with a hacksaw. It now has some top venting, but looks like a dogs dinner. Note to self, don't mod when angry.
These will take alot of abuse:
Anytime Tools 5 DIAMOND CUT-OFF WHEELS GLASS ROCK LAPIDARY DISC SAW for ROTARY TOOLS - Power Rotary Tool Cutting Wheels - Amazon.com
Assuming you are using a safe chemistry (IMR, INR), the cell will not explode, it will vent. The violence of this venting varies from a small to amount of liquid and gas seeping out, to it going off smoking and ejecting flames like a bottle rocket. If these gases are contained and not allowed to escape in a timely fashion, as in the there is not adequate venting in the mod, then you have a pipe bomb.
A hacksaw blade would be an easier way than a drill.
Or start with the hacksaw just to make a starting surface semislot, then drill at that point.
IMR and INR chemistry batteries vent from the top. They are designed to "vent" or leak the gas from the top, otherwise the battery cell itself would certainly explode because of the rapid creation of gas. The gas is created by the chemical reaction from a battery going into thermal runaway.
Lithium batteries are of different chemistries. ICR (protected) and Li-Po batteries can vent gas, flames and/or explode. They are not considered safe chemistry.
IMR (Li-Mn) and INR (hybrid IMR) vent gas but generally don't flame or explode, therefore they are known as safe chemistry and don't require a protection circuit on the battery.
Deeper Understanding of Mod Batteries
However, its the accumulation of gas in a sealed metal tube (mod) which can turn your mod into a pipe bomb if there is not adequate venting. Mech mods with vent holes in the top of the mod are safer than those with holes in the bottom, because the battery may block the escape of gas out the bottom. This is particularly more important for mechanical mods than regulated mods. You likely would not get to the point of a venting battery with a regulated mod because of its protection circuitry.
Mech Mods with top venting holes?
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I got so into describing venting, I ended up not actually answering OPs question about venting from the top. 
Well I'm thankful I've never experienced that. I have been using mechs topped with sub-ohm gennies for the last 3 years, doing so with regard to Baditude's excellent advice posted here to ECF. I have never used trash batteries or coiled for dangerously sub-ohm builds. My mechs are Poldiacs, which do not have top vents, and I'm not about to cut into them to make those, but I don't think I'm in any danger at .7 ohm and swapping out my batteries at 3.8 v.
I don't suggest that you cut up your Poldiac with a hacksaw. I let my anger get the better of me, and I didn't expect to make such a mess of it. It's an $8 clone so I'm treating it as an inexpensive experiment. I don't mean to alarm you, but using good batteries and sensible builds makes no difference if you short the battery. I may have ruined the aesthetics of my SMPL, but I feel safer for it. Does the Poldiac have any ventilation? If not then some discreet tidy 1mm holes would be a worthwhile sacrifice in my opinion, even if it devalues your $200 mod.
Yes it does have vents. Rather large vents. I've never yet shorted a battery.
I still do not understand. If your mod vents from the bottom, install the cell(s) with the positive facing down. SMPL/SMPL+ included. This has been done for years in the competitive vaping community (clouds + tricks). So long as you verify the integrity of your wrap(s) (which should be done regardless), a mechanical with vent holes and cell(s) installed with the positive oriented towards the bottom of the mod is arguably safer than the inverse.
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