Battery safety fuse questions

[raavysaavy]

Hello,

I have seen these battery fuses, like 2 cents for safety, or vapesafe. It's the little disc that attaches to the bottom of the battery.

I see that they have a 7 amp fuse and am curious if anyone knows why 7 amps was chosen.

I have seen these on fasttech, but they are only 2 or 4 amps. Would 4 amps be sufficient?

Also, is there a way to check, with a multimeter, or any other way, that these fuses are "working" correctly before being used? I did pick up one of the 4 amp battery fuses from fasttech, but would like to see if they are active and are not duds before I pop them on my battery and in my mod.

Thanks,

Raavysaavy

 

[epicdoom]

its a fuse so should work like any other fuse device touch pos lead to one terminal and neg to the other should measure 0 resistance or very close to it if good. and OL or open if bad

 

[p7willm]

Up until recently the batteries could only supply 10 amps, according to the manufacturer, and 7 was a safe number with some left over for safety.

Using an ohms law calculator fill in the voltage from the battery and the amps through the fuse and you will find that you get about 14 watts with a .9 ohm coil. The fuse will protect your battery, and you, if something goes wrong and the resistance drops.

If you are using a regulated mod, variable voltage or variable watts, you do not need the fuse since the mod will stop you from drawing too much power.

I just had something break in my atty that gave me a short in it. If I had a fuse it would have blown and I never would have gotten a hot mod. Something for me to think about.

 

[Sthur]

In theory you can go as low as 0.61 ohm and get 6.8 amps and 29 watts with that fuse. For most that's good enough. I like my mech at 0.49 and my rda, but was liking dual 28 at 0.65 for a while too.

http://www.ohmslawcalculator.com/ohms_law_calculator.php

If you want a piece of mind when dripping I would run one and a 10amp battery.

 

[CloudsinCrowds]

a vtc 5 and a fuse also can make one feel quite comfy with all that wonderful overhead.

i found the inline fuses in the GUS stuff be very awesome especially the 12 amp fuse they offer, i have been looking 2 cent for safety style 12 amp fuses.

 

[DaveP]

This link will give you some guidelines about batteries and C-ratings and it even lists batteries by manufacturer and model, along with amp ratings. You should be able to get an idea of what to use and how to fuse it. 4.2v on a .6 ohm coil produces a 7 amp draw and a 29.4 watt vape. Stay under that level and the fuse won't blow. Most any battery above 1000mah should have an amp rating far above 7 amps. Look at the battery listings at the link below.

Taste Your Juice | BATTERY INFORMATION

You can also use the ohms law calculator at this link. Enter the voltage you want to vape and the resistance of the coil and it will produce the amp draw and wattage for that combination. Safety is a good thing if you are vaping a mech at high watts. The fuse will at least give you some peace of mind that it will open if you exceed a certain level. I think they chose 7 amps because it provides enough headroom to allow a good vape without pushing the battery into overheat before the fuse pops. Spewing batteries happen quickly once the heat and pressure builds. You don't want any part of your body close by if that happens. There's not enough time to chuck it and run before catastrophic meltdown. High Drain batteries are much more forgiving, but you need a fuse in a mech. Electronic mods govern this internally for safety.

Ohm's Law Calculator