New iJoy 20700 battery draining super fast?

[dxrkblcxk]

Hey all! First time poster, new vaper as well. I recently purchased a Broadside Admiral clone from eBay that had good reviews and also purchased a legit 5 leg iJoy 20700 along with a Goon v1.5 RDA clone.
I know there’s a lot of factors that go into account when it comes to how fast a battery will drain, however I never overcharged this battery. Once it hits full I take it off within a minute or so and I haven’t let it get under 3.7v of charge. I literally just charged it before taking another kind of smoke when I stepped out and I probably took around 15-20 hits. When I went home to charge because I noticed the battery doesn’t last long, it hit a record low of clocking in at 3.8v already so quick since about half hour of 15-20 hits. Is my battery faulty? My current coil setup is dual parallel 24g 8 wrap coming in somewhere between 0.1-0.15 (my multimeter doesn’t have an extra decimal place unfortunately).
I appreciate all the replies. Just know I have also done my fair share of research and educating myself with a lot of videos and taking basic safety precautions before you go judging my first time setup

 

[Fudgey Finger]

It sounds to me like it is discharging normally. These cells have a nominal voltage of 3.7v. If you fully charge them to 4.2v they don't stay up there for very long. 15-20 pulls could bring the cell down to its nominal voltage, especially if you are around 0.1 ohms. If you look at one of Mooch's discharge graph you will see that these lithium ion cells we use drop quickly to 3.7 but then hang out around that voltage for most of the discharge. If the cell is at 3.8v after 15-20 pulls, but then reads 3.0v after another 15-20 pulls, then you might have something to worry about.

 

[The Cromwell]

First question does your multimeter read 0 ohms with the leads shorted?
whatever your multimeter reads with the leads shorted must be subtracted from the reading you get on your coil.

15 - 20 hits to drop a charged battery to 3.8 volts is not unusual at .1.

 

[dxrkblcxk]

It reads 0.2 with the leads shorted, and yes I have subtracted that from the ohm result. I was already aware of that detail but I still appreciate that tip because it’s totally very crucial for any new vaper trying to go that low. I appreciate the replies so far. I thought it was a bit unusual. So I have to carry like 4 batteries if I step out?

 

[HondaDavidson]

You vaping at 176 watts and 42amps at full charge about 136 at 3.7 and 130 at 3.5.....

Steam-engine.org comes in at around 60puff... for a 4000f mah batt.... not perfect didn't use actual batt specs. considering the ramp time of your build 20 puff isn't outside possibility.

Why are you setting g yourself up to be the next Vaping Poster Child. And vaping at the extreme limits of you battery.



Sent from my SCH-I605 using Tapatalk

 

[fightinggoat]

Sounds pretty normal to me, my single battery mechs use batteries so much faster than my two and three battery mechs, even though they are in series and put out a lot more power.

Single battery tubes are pretty abysmal when it comes to power and battery life compared to everything else.

 

[The Cromwell]

It reads 0.2 with the leads shorted, and yes I have subtracted that from the ohm result. I was already aware of that detail but I still appreciate that tip because it’s totally very crucial for any new vaper trying to go that low. I appreciate the replies so far. I thought it was a bit unusual. So I have to carry like 4 batteries if I step out?

Why not use a regulated mod?
If you want to stick with what you have, yep you will have to carry a few batteries considering your vaping style.

 

[fightinggoat]

I guarantee it doesn’t hit like it’s 175 Watts, the battery just doesn’t support that amp draw and can only give so much. The voltage drop and battery sag at that resistance makes it vape more like 100-120 watts, even though the math says it’s 175. There are some things the formula doesn’t account for.

I won’t say it’s unsafe because I tend to vape my broadside at .1-.15ohms myself, it’s still a very cool vape compared to my .35ohm build at 8 volts in my series mech.


Steam engine is great for what it is, but in actual use I find that you can’t draw more from the batteries than what they can keep up with, doesn’t mean trying to pull too much can’t be dangerous or damaging to the batteries, just meaning that just because steam engine says that .05 ohm build will be 250 Watts from a single battery, doesn’t make it true.

A single battery only has so much chemical energy to give.

 

[fightinggoat]

Why not use a regulated mod?
If you want to stick with what you have, yep you will have to carry a few batteries considering your vaping style.

Or let me build you a mech box that will give you much more power and better battery life.
I am just starting to build my own, but they are turning out nice and I am pleasantly surprised whenever i change my batteries after hours of vaping big and flavorful clouds, only to find that they are still at 3.9-4volts.

 

[The Cromwell]

I guarantee it doesn’t hit like it’s 175 Watts, the battery just doesn’t support that amp draw and can only give so much. The voltage drop and battery sag at that resistance makes it vape more like 100-120 watts, even though the math says it’s 175. There are some things the formula doesn’t account for.

I won’t say it’s unsafe because I tend to vape my broadside at .1-.15ohms myself, it’s still a very cool vape compared to my .35ohm build at 8 volts in my series mech.


Steam engine is great for what it is, but in actual use I find that you can’t draw more from the batteries than what they can keep up with, doesn’t mean trying to pull too much can’t be dangerous or damaging to the batteries, just meaning that just because steam engine says that .05 ohm build will be 250 Watts from a single battery, doesn’t make it true.

A single battery only has so much chemical energy to give.

Yep with a full charge that battery is likely only putting out a maximum of 3.6 volts or so with that load on it.
And will rapidly go downhill from there.
So with a .1 ohm coil you get around 136 watts with a fully charged battery and about 1/3 thru the discharge drop to under 100 watts.

The Sony VTC5A 18650 will perform MUCH better than the Ijoy 20700 you are currently using.
Compare it in Mooch's charts.

Although with you vaping load I recommend a Mooch approved 30 amp cell the VTC5A is rated at 25 amps.

 

[Fudgey Finger]

I guarantee it doesn’t hit like it’s 175 Watts, the battery just doesn’t support that amp draw and can only give so much. The voltage drop and battery sag at that resistance makes it vape more like 100-120 watts, even though the math says it’s 175. There are some things the formula doesn’t account for.

I won’t say it’s unsafe because I tend to vape my broadside at .1-.15ohms myself, it’s still a very cool vape compared to my .35ohm build at 8 volts in my series mech.


Steam engine is great for what it is, but in actual use I find that you can’t draw more from the batteries than what they can keep up with, doesn’t mean trying to pull too much can’t be dangerous or damaging to the batteries, just meaning that just because steam engine says that .05 ohm build will be 250 Watts from a single battery, doesn’t make it true.

A single battery only has so much chemical energy to give.

What you are describing isn't a flaw in ohms law, it is a flaw in the numbers you are using. It is up to each one of us to account for the factors you are describing. This is why people recommend using 3.7v in an ohms law calculator to get a better idea of what the true wattage of the coil will be, but using 4.2v for safety reasons.

OP, I think you are finding out that single battery mods aren't very well suited for those of us that like to vape at high wattage. My first mech was a single cell tube. If I could go back I would have chosen a parallel mod. With a single cell at high wattage you have to push the batteries so damned hard that you don't get much life out of you cells and you are increasing the chances of a battery failure. Don't get me wrong, I have a few tubes with builds below 0.15, but they aren't my all day carries because I don't want to carry around a bunch of batteries.

As @fightinggoat was saying, each cell can only deliver so much power. Mooch talks about cells having a point of diminishing return. This is where building lower will theoretically give you more wattage, but because you are pushing the cell so hard the extra voltage sag almost negates the extra wattage you would expect to get.