Joyetech cuboid weak battery ?!!!

[darkshaft]

Hello vapers, recently bought Joyetech cuboid + 2 brown lg hg2. After few days of using found that it gives me weak batteries below 3.5 volts, while in manual it says it should show weak batteries below 2.9 volts. Whats wrong?

Other issue, am using dual clapton build at 0.38 ohms, sometimes it shows 0.38, while other times 0.40 ohms, or 0.44 ohms, is this normal??

Am on firmware 3.1, thank you.

 

[Wingsfan0310]

I'll take a guess at your battery issue. If 3.5v is the resting voltage, it could very well be 2.9v while under load (depending on what power you are firing at - aka voltage sag). My IPV3 Li batteries are in the 3.5v range for resting voltage when I get the weak battery message as well.

Cheers,
Steve

 

[darkshaft]

I'll take a guess at your battery issue. If 3.5v is the resting voltage, it could very well be 2.9v while under load (depending on what power you are firing at). My IPV3 Li batteries are in the 3.5v range for resting voltage when I get the weak battery message as well.

Cheers,
Steve

Am firing at 55w, so your saying weak battery just below 3.5 v is normal?

 

[Wingsfan0310]

I don't have that particular mod. What I'm saying is at a 3.5v resting voltage, 18650's are just about spent. I'm also saying my IPV3 Li operates the same way. I think that's a good resting voltage to recharge at. Others who have that particular mod may chime in to tell you what resting voltage their weak battery prompt comes on at. I wouldn't want my resting voltage to be at 2.9v when I pulled mine, that is too low imo. All my dual 18650 mods have been in the 3.3x-3.5x resting voltage range when getting the weak battery prompt.

After that long drawn out answer, I'd say it's normal

Cheers,
Steve

 

[cascadian]

Hello vapers, recently bought Joyetech cuboid + 2 brown lg hg2. After few days of using found that it gives me weak batteries below 3.5 volts, while in manual it says it should show weak batteries below 2.9 volts. Whats wrong?

Other issue, am using dual clapton build at 0.38 ohms, sometimes it shows 0.38, while other times 0.40 ohms, or 0.44 ohms, is this normal??

Am on firmware 3.1, thank you.

First, the low voltage cutoff of the Cuboid is 3.1V not 2.9V. Second, the Cuboid requires 25 A CDR batteries, not 20 A like the HG2 batteries you are using. For these reasons you are experiencing the cutoff sooner than you expect.

A higher capacity lower CDR battery frequently doesn't perform for any longer in this application due to the higher internal resistance of the cell. Internal resistance is the cause of what most refer to as battery sag. If you want your batteries to read closer to the 3.1V cutoff when you receive the weak batteries warning, use a higher CDR rated cell like the Sony VTC4. You wont get any more puffs on a charge but you wont receive the weak batteries warning until 3.2V typically.

 

[Vapomizer]

Hello vapers, recently bought Joyetech cuboid + 2 brown lg hg2. After few days of using found that it gives me weak batteries below 3.5 volts, while in manual it says it should show weak batteries below 2.9 volts. Whats wrong?

Other issue, am using dual clapton build at 0.38 ohms, sometimes it shows 0.38, while other times 0.40 ohms, or 0.44 ohms, is this normal??

Am on firmware 3.1, thank you.

The inconsistent resistance reading means that either you have a loose connection somewhere on your coil, atty or tank base, or your Cuboid's 510 spring is stiff and not making a perfect connection with your tank, this has been addressed extensively in another thread, i am on mobile currently so can not provide the direct link but the thread was about an RX200 with the same issue.

 

[darkshaft]

Thank you guys.

 

[darkshaft]

The inconsistent resistance reading means that either you have a loose connection somewhere on your coil, atty or tank base, or your Cuboid's 510 spring is stiff and not making a perfect connection with your tank, this has been addressed extensively in another thread, i am on mobile currently so can not provide the direct link but the thread was about an RX200 with the same issue.

Indeed it does have a stiff 510 connection, is there a solution? I had similar problem with istick 50w

 

[Vapomizer]

Indeed it does have a stiff 510 connection, is there a solution? I had similar problem with istick 50w

Try this

http://vapingunderground.com/thread...m-with-the-reuleaux-rx200.193737/#post-930974

 

[Wingsfan0310]

First, the low voltage cutoff of the Cuboid is 3.1V not 2.9V. Second, the Cuboid requires 25 A CDR batteries, not 20 A like the HG2 batteries you are using. For these reasons you are experiencing the cutoff sooner than you expect.

A higher capacity lower CDR battery frequently doesn't perform for any longer in this application due to the higher internal resistance of the cell. Internal resistance is the cause of what most refer to as battery sag. If you want your batteries to read closer to the 3.1V cutoff when you receive the weak batteries warning, use a higher CDR rated cell like the Sony VTC4. You wont get any more puffs on a charge but you wont receive the weak batteries warning until 3.2V typically.

Even if his batteries were at 6v for the total, he would still only be drawing less than 10 amps for 55 watts. The more the charge drops, the higher the voltage sag will be when you attach the load. The mod shuts off under load (not resting voltage), once the load is removed, the voltage bounces back up to a higher level. At a setting of 55 watt, using 20 amp batteries has nothing to do with it.

 

[darkshaft]

Is 130 puffs, 650 seconds normal for 0.38 ohm running at 55w for lg hg2?


Also does kanthal wire differences changes battery drainage? Example clapton at 0.4 ohm, and kanthal 24 awg at 0.4 ohm both running at 50w

 

[cascadian]

Even if his batteries were at 6v for the total, he would still only be drawing less than 10 amps for 55 watts.

No! At 6V total the mod would not fire. It has a low voltage cut off of 3.1V as I stated previously.

At a setting of 55 watt, using 20 amp batteries has nothing to do with it.

And exactly what are your qualifications to make this assertion? Joyetech specifies 25A CDR batteries for a reason. That reason includes the FACT that CDR is related to the internal impedance of the cell. When one goes up, the other must go down. The HG2 is specified as less than or equal to 20mOhms. The VTC4, the cell Joyetech recommends, is specified as between 7 and 15mOhms with a mean of 11mOhms. The other reason is to insure that the device can be utilized at it's maximum output safely.

This is not speculation based on an crude understanding of Ohm's law gained on the internet. It is fact. He is using cells that do not meet the minimum specifications for his device. As a result the mods low voltage cut off is triggering sooner than he expects due to battery sag. Battery sag is determined by the relationship between load and the internal impedance of the cell. The causation is well established in not theory or speculation but the physical laws of electronics. Your assertion that the devices settings have anything to do with these facts is false. In this situation you can not ignore that extensive electronic circuitry is isolating the input side of the circuit from the output side. In essence you must treat the mod as two separate circuits when analyzing it. The circuit is the load for the source, and the atomizer is the load for the circuit.

 

[Wingsfan0310]

Thanks for the lesson. I have a degree in Electronics Engineering Technology and my dad is an EE. I was telling you he had his wattage set to under 60 watts and his batteries in series had over 6 volts combined. He was drawing less than 10 amps from his 20 amp batteries. I was saying at that setting he wasn't drawing to many amps from his batteries. Always a pleasure to be talked down to. Thanks, i appreciate it.

 

[darkshaft]

Guys calm down, we are here to vape, and discuss vape issues, not show our muscles, cool down, and thank you both for helping me understand more.

 

[Vapomizer]

I think it makes sense, a battery with lower CDR and the negatively correlated higher internal resistance would sag more under load triggering the device's low voltage cutoff protection earlier, so even though the battery is showing higher voltage at rest, once load is applied and with a higher internal resistance the voltage would dip below the cutoff level

It has everything to do with the batteries being rated at 20A CDR for its higher internal resistance casing more sag and voltage drop than a 30A CDR batteries like the VTC4

 

[Vapomizer]

Also 6V combined is BELOW the Cuboid's cutoff voltage protection of 3.1V PER BATTERY, the Cuboid measures every battery's voltage independently and cuts off when ONE of them reaches 3.1V under load, so it only takes one battery to drop below 3.1V under load for the Cuboid chip to cut power off.

 

[BigDaddyQ]

I think what most don't realize is the Cuboid has a balancing point connection at the bottom plate and can sense the voltage of both cells. When you hit it and it sees one or the other battery drop to 2.9 volts or lower, it gives the weak battery error. The 2.9 volt cutoff is per cell not overall. This is to prevent damaging the cells.

 

[darkshaft]

They put a lot of safety measures, and gave us weak battery life mod. How do you guys make it through the day? Should i buy extra batteries or just trad it in for rx200?!!

 

[Angrygod50]

They put a lot of safety measures, and gave us weak battery life mod. How do you guys make it through the day? Should i buy extra batteries or just trad it in for rx200?!!

If you vape like most of us you need extra batteries and a charger. Your drawing a lot of amps vaping. The HG2 will last as long as any good battery and I haven't seen any posts about short battery life in the Cuboid so it's probably the same as any dual battery mod. The RX200 will last longer with 3 batteries but you need to marry batteries not add one to the ones you already used.

I'd say go to http://liionwholesale.com/ buy a charger and two more batteries.

 

[RatRacer]

The Cuboid is my work desk mod. I get 2+ 8.5hr days on a set of HE4's @1.2ohm.

 

[Angrygod50]

Is 130 puffs, 650 seconds normal for 0.38 ohm running at 55w for lg hg2?


Also does kanthal wire differences changes battery drainage? Example clapton at 0.4 ohm, and kanthal 24 awg at 0.4 ohm both running at 50w

Heavy gauge wire or captions running at 0.4 ohms will drain batteries faster than thinner gauge at higher ohms. http://www.steam-engine.org/coil.asp is a builders best friend.

 

[darkshaft]

Heavy gauge wire or captions running at 0.4 ohms will drain batteries faster than thinner gauge at higher ohms. http://www.steam-engine.org/coil.asp is a builders best friend.

What if thick clapton and simple kanthal lets say 24 awg both with same ohm, would battery life differ if am firing at same wattage? Thanks for link.

 

[darkshaft]

Is lg hg2 better for battery life than vtc4 in cuboid using 0.2-0.3 ohm at 50w?

 

[Wingsfan0310]

What if thick clapton and simple kanthal lets say 24 awg both with same ohm, would battery life differ if am firing at same wattage? Thanks for link.

If you are firing at the same wattage for the same amount of time, battery life should be the same.

Is lg hg2 better for battery life than vtc4 in cuboid using 0.2-0.3 ohm at 50w?

At 50 watts you will be drawing less than 10 amps, well under the CDR of either battery. Considering the HG2's are rated at 3000mah (I believe Mooch tested them at ~2950mah) and the VTC4 are a 2100mah battery. You should see longer run-times between charges with the HG2's.

Here's a link to the top 5 18650 batteries for vaping (both are listed in the article).

Cheers,
Steve

 

[darkshaft]

If you are firing at the same wattage for the same amount of time, battery life should be the same.


At 50 watts you will be drawing less than 10 amps, well under the CDR of either battery. Considering the HG2's are rated at 3000mah (I believe Mooch tested them at ~2950mah) and the VTC4 are a 2100mah battery. You should see longer run-times between charges with the HG2's.

Here's a link to the top 5 18650 batteries for vaping (both are listed in the article).

Cheers,
Steve

What about battery sag between the lg hg2 and vtc 4? Would that make a difference

 

[Wingsfan0310]

What about battery sag between the lg hg2 and vtc 4? Would that make a difference

I personally don't think so since you are drawing less than 10 amps. There really is only one way to know for sure. Try them both and see what the voltage is when you get the low voltage/change battery.message. I don't have the mod so I can't do the testing for you.

 

[digiplay]

I wouldn't be running those batteries to 2.9 if you expect hem to last. By 3.5 on a mech is be done. You aren't using it in bypass mode are you? If you're using it unregulated then 3.5 would be the bottom Of what I'd vape on. 3.5 unregulated is not a powerful vape maker

Double checked and saw cuboid does have a bypass mode. So I'd check that. Maybe it's unintentionally on and that would make the vape really weak compared to fully charged 4.2 output.

I guess if you're putting out 55 watts it's probably not on. But it Maybe something weird like its on but allowing some kind of over charge or something

 

[Superjeep]

The HG2 has a standard end voltage (cut off)of 2.5 volts and a pulse rating of 35 amps. So unless your taking 10+ second hits (which the mod wont let you do) I think you will be just fine. Would I use them in a mech? personally no but in a regulated mod they are great batteries.

Keep in mind these are mass produced so you always run the chance of getting a dud battery. Signs of a bad cell are of course faster discharge but watch them while they are charging and it a cell charges fairly faster than another in a set its time to probably toss it.

 

[darkshaft]

I do know 3.5 volts is best for battery life, i was surprised cause in manual it says mod will give weak battery at 2.9 volts, so thought something was wrong.

 

[Superjeep]

Ya but that weak battery is under load. If you take it out and put it on a charger with a readout or a meter it should indeed read 3.5. Even a fresh battery charged to 4.2 will start to sag as you vape it it does not stay at 4.2 they drop under load then come back up.

 

[billaboy3d]

i have this problem with my cuboid, do someone got any tips for this issue?

 

[billaboy3d]

when i have it on 90 watt on power mode with full batteries i just goes on 70watt and says weak batteries, someone please help :/ im useing a tfv4 tank with a 0,2 ohm coil

 

[RatRacer]

when i have it on 90 watt on power mode with full batteries i just goes on 70watt and says weak batteries, someone please help :/ im useing a tfv4 tank with a 0,2 ohm coil

What batteries?

 

[billaboy3d]

What batteries?

Original SAMSUNG ICR18650-26F 2600mAh 3.7V they are new and my cuboid is showing 4.14 and 3.94 volt.

 

[billaboy3d]

i cant vape at 90 watts on power mode when the batteries are fulley charge by the usb charger, it jumps down to 70watt ish and says weak battery. My ohm is jumping like crazy everytime i take of my tank and put it back on, it jumps from 0.22 to 0.36. i have ordered a nitecore charger and 4 lg hg2 batteries if that will help

 

[RatRacer]

Original SAMSUNG ICR18650-26F 2600mAh 3.7V they are new and my cuboid is showing 4.14 and 3.94 volt.

Dang, you should be good there. I use HE4, and work fine. If it continues, I'd say you got a gremlined mod.

 

[billaboy3d]

Dang, you should be good there. I use HE4, and work fine. If it continues, I'd say you got a gremlined mod.

what is a gremlined mod?

 

[RatRacer]

what is a gremlined mod?

A mod, with gremlins.

 

[billaboy3d]

A mod, with gremilins.

do you think it will work with the lg hg2 batteries if i charge them with a separate charger or is my mod fcked? :/

 

[billaboy3d]

i drove up to my friends house and tryed his Genuine Samsung ICR18650-30A 3000mAh batteries and i could vape and 120watt without that stupid weak battery showing up

 

[fantasticplastic]

Cuboid user here.

I use two sets of samsung inr 25r batteries on rotation for my cuboid. By the time the battery meter is drained, i get the weak battery sign. When i pop those on my xstar vc2 charger, they both read exactly 3 volts.

I get about a day's worth of vape with one set of cells, and I am currently vaping 60~70 watts on 0.31 ohm build.

 

[TechnoGeek]

Cuboid user here.

I use two sets of samsung inr 25r batteries on rotation for my cuboid. By the time the battery meter is drained, i get the weak battery sign. When i pop those on my xstar vc2 charger, they both read exactly 3 volts.

I get about a day's worth of vape with one set of cells, and I am currently vaping 60~70 watts on 0.31 ohm build.

Ditto on Cuboid, and Samsung 25r batteries.... When I place them in the charge when weak batter is displayed, somewhere between 3.1 - 3.2, which is what I would expect....