One battery, different voltages for the EVO?

[therealcmac]

Hi guys. I have and EVO VV coming and with all the talk of stacked batts being an issue (especially since these are not protected) I am wondering if anyone knows if it is possible to use a single batt of some kind that will allow you to still use the 3 different voltage settings (the EVO uses/comes with two unprotected 16340 (700mah)batteries)? I know you can use a single 16650 to get "ego" mode, but you cannot use the different settings this way. Or are there protected batteries that i could use two of in the EVO? Any info or thoughts would be appreciated from you guys and gals. Thanks

 

[Spac]

The single battery will put the unit into Ego mode. 3.7 volt and that's it.

You need the 2 batteries to get the Multi volt action.

AS for the safety, I'm not too concerned. Provided you're smart and cautious, you're fine. Always keep the batteries as a pair and label them as such. And if you can, switch the loading everytime you charge them. IE, 1 battery on top this time, the other on top the next time in the stack.

Also seems that the charger it comes with does not balance the charge. I got a Trustfire charger from Song and the first time I charged the batteries in it, one cell charged way longer than the other. Not good. (Since this charge, they're done within a minute of eachother)

The included charger doesn't seem to charge each cell independently like the Trustfire, so the cells may become over charged or over discharged.

If you exercise caution, your chances of failure will be on par with a single cell.

 

[therealcmac]

The single battery will put the unit into Ego mode. 3.7 volt and that's it.

You need the 2 batteries to get the Multi volt action.

AS for the safety, I'm not too concerned. Provided you're smart and cautious, you're fine. Always keep the batteries as a pair and label them as such. And if you can, switch the loading everytime you charge them. IE, 1 battery on top this time, the other on top the next time in the stack.

Also seems that the charger it comes with does not balance the charge. I got a Trustfire charger from Song and the first time I charged the batteries in it, one cell charged way longer than the other. Not good. (Since this charge, they're done within a minute of eachother)

The included charger doesn't seem to charge each cell independently like the Trustfire, so the cells may become over charged or over discharged.

If you exercise caution, your chances of failure will be on par with a single cell.

Ok, good advice on labeling the batteries Spac, thanks. The kit now includes a Trustfire Tr-001 Multi charger, this is a good charger no?

 

[Spac]

It's the one I got. And I certaily trust this over the cheapie one I got with it. It independantly charges each cell. This way every charge it should bring each cell to the same charge/voltage.

If you want to be doubly sure, every couple charges check each cell with a multimeter to verify the voltage (Health) of the cell. This is by no means completely fool proof, but like I said earlier, exercise caution to reduce your risk as much as possible.

 

[therealcmac]

I should be able to use these correct? 2 Pack of PTC/CID Protected 16340 700mAh Batteries

EDIT: These are actually the same batteries that Song carries and includes with the EVO, he suspects that they are not actually protected, but i am going to fire off an email to confirm 100% these are protected or not......

EDIT#2:Ok so now i just want to know if a protected (PCB) 16340 battery will work at all in the EVO, i understand they are a very snug fit but should work (does the protection limit the output)? And can i purchase a higher mAh battery, a 1100 mAh?

EDIT#3:I really overthink things sometimes.....i just thought of that.

 

[therealcmac]

Well in case anyone is interested Mindfield has just made a video demonstrating one way to increase the safety factor of using unprotected batteries, I for one am going to do it, and suck on my EVO till the cows come home Thanks to Song from Vaporus, Minfield and Spac for helping me out with my question!

 

[Switched]

I should be able to use these correct? 2 Pack of PTC/CID Protected 16340 700mAh Batteries

EDIT: These are actually the same batteries that Song carries and includes with the EVO, he suspects that they are not actually protected, but i am going to fire off an email to confirm 100% these are protected or not......

Reading up on PTC/CID and looking at the pics, it does seem that these batts are not externally protected, for over charge and low voltage cut off. The sole purpose of the PCB board. However, it does include the necessary internal components of all LI Ion batteries PTC/CID to prevent runaway. http://www.nasa.gov/pdf/345992main_NESC TB 09-02_Li Ion Battery Limitatations.pdf and The Anatomy of a Protected Battery

EDIT#2:Ok so now i just want to know if a protected (PCB) 16340 battery will work at all in the EVO, i understand they are a very snug fit but should work (does the protection limit the output)? And can i purchase a higher mAh battery, a 1100 mAh?

If the current batty config is tight, you may not be able to add a protected battery because of the thin protection strip, making the battery too thick, or the PCB which adds to the overall length by 1-2mm.

Wrt increasing the mAh - nope buy a bigger vehicle with a larger gas tank. Only so much fuel can go in to a defined space.

 

[Switched]

It's the one I got. And I certaily trust this over the cheapie one I got with it. It independantly charges each cell. This way every charge it should bring each cell to the same charge/voltage.

If you want to be doubly sure, every couple charges check each cell with a multimeter to verify the voltage (Health) of the cell. This is by no means completely fool proof, but like I said earlier, exercise caution to reduce your risk as much as possible.

I would like to add...

When checking voltages, take readings with your MM 5-10 minutes after charging and discharging. The batts internal have stabilised after ION excitement.

Always charge in pairs and rotate between top and bottom on subsequent use. e.g label A1 and A2 and alternate each and every time you use them. This will assist in insuring the batts drain at the same rate and help to distribute internal resistance equally between the batts (most important). You will notice that when removing a pair, that the batt closest the load (atty) will have drained more.

Keep a mental record of charging and discharging times from new. As internal resistance increases, available vaping time between charges decreases as well as charging time (less active electrolyte to charge) due to the rock content of the cell (these particles can no longer accept a charge) caused by internal resistance - a normal phenomena of using batteries. IMO when the battery set starts to spend more than 1/2 its time of the charger, it is time to toss the stack.

Do not solely rely on mfr specs wrt charge cycles. e.g. 500 cycles. If you are charging your batts twice a day (normal for 16340s and below) Your batts have reached their life span in 1/2 to 2/3 of the year e.g. 180 to 240 days or 6-8 months.

 

[therealcmac]

Great info! Thank you Switched.......I still might have enough dough for that 50 Cal.......my wife may kill me though

 

[Switched]

All is cool my man. The ones I make aren't loaded, so she can't use it against you in family court

 

[Spac]

Bang on switched! Summed it up perfectly! Was a bit late when I was typing and was trying to get some of what you said across and couldn't... Needed sleep.

 

[Spac]

Oh and the batteries on the EVO will last you pretty much the whole day. Using it on the med (4.5 volt i think) setting, I get the whole day out of her, and that is killing off a full 4ml DCT and then some more...

I would like to add...

Do not solely rely on mfr specs wrt charge cycles. e.g. 500 cycles. If you are charging your batts twice a day (normal for 16340s and below) Your batts have reached their life span in 1/2 to 2/3 of the year e.g. 180 to 240 days or 6-8 months.

 

[Spac]

And I just realized, Mindfield strikes again...

 

[Song]

Not really sure if i can post this but switched and spac pretty much got it dead on, also another thing about high mah rating on same size batteries, the higher the mah, the higher the energy density in the battery their only so much mah you can cram in a battery and still have it remain safe, increase the mah beyond that for the same size and type of batteries and the battery could become unsafe and more unstable.

Protected vs unprotected - someone correct me if i'm wrong but protected li-ion batteries are the ones with a PCB on the bottom, unprotected ones most of the time feature the PTC and CID.

here is a link to a page that explains it nicely The Anatomy of a Protected Battery

 

[Switched]

Yuz would be right MR Song

 

[therealcmac]

And I just realized, Mindfield strikes again...

Take a look at post #6 lol

 

[Spac]

O.k. Nevermind. Apparently I really needed more coffee this morning. Missed your post completely for some reason....

 

[rayboy55]

Song, i know the EVO comes with unprotected 3.7 v 700mah batteries , but trustfire makes 2 kinds of 16340..
1- 16340 3.6v 880mah
2- 16340 3.7v 880mah ...both protected batteries so can we use these in the evo or 880mah is too high ????Thanks !!

 

[Mindfield]

Song, i know the EVO comes with unprotected 3.7 v 700mah batteries , but trustfire makes 2 kinds of 16340..
1- 16340 3.6v 880mah
2- 16340 3.7v 880mah ...both protected batteries so can we use these in the evo or 880mah is too high ????Thanks !!

The mAh rating is just the charge capacity -- how much charge it holds. The bigger problem here is that protected batteries are not good at handling applications that demand a lot of power -- like using dual coils at higher voltages. They can't supply that kind of instantaneous power on demand for sustained periods and using them that way, while possible, can damage them.

Use a pair of AW IMR 16340s. They are lower capacity (500mAh) but they are capable of delivering 5x the amount of sustained current as the average protected battery, so they can handle any high-power demand, even 1.5ohm dual coils at the high setting -- that's what they're made for.

 

[rayboy55]

Thanks for the info...so i should just use the batteries that comes with it !!!