LG hg2 in mid wattage device-thoughts?

[conanthewarrior]

Hi people. Hope you're OK.

I usually use 25R's, getting quite a collection of them lol, but ordered a LG HG2 to use in the 75WTC sig thinking it would last longer, it doesn't though. It gets down to just over half battery, then when I fire it sags so much it says 'check battery' so I have to change it out.

A 25R works all the way down if I want it too, so it actually lasts less time than the 25R for me.

I have put it in my missus sigelei 50W tonight, as she uses it at 16 watts with a nautilus mini at the moment, we have some subtank minis on the way for both of us as she likes the direct to lung of my lemo to , and wants to get building, plus I always wanted a subtank mini. Can never have too many tanks or drippers lol!

Because she is using it in a device at lower wattage ( I was only using it around 35W, not exactly super high) should it last her longer than a 25R without the sag problem? I change the battery for her every night, but the past 2 nights have shown her how to do it, and instructed her how to put it in and she has.

I just need to get her to understand the charger next lol.

So, should it last longer than the sammies do, or do you think the 25R's are hard to beat?

Also, all my 25R's are blue. I see the newest are now green, is there any change internal for this change, or have they just changed the wrapper for no reason?

Thanks people who take the time to read and answer my threads, I know I can waffle on a bit so thank you .

 

[Mike H.]

The new green 25R's are supposed to be a slightly different chemistry to improve the number of charging cycles, from what ive read..Other than that it should be the same great battery.

I dont see how an LG HE2 couldnt handle 35 watts...i tend to not wait for the battery cell to run super low before changing it out for a fresh battery...My version of the he2 is the efest purple 2500 but, its the same battery and ive had no issues with it.

 

[conanthewarrior]

Sorry its the HG2 I have, the 3000MAH 20 amp battery?

I think I may have a bad cell though, as my efest 'in house' batteries that are meant to be 35 amp are probably rewrapped hg2's from the B bin due to not holding 3000MAH. These last longer than my LG HG2 does, so I suspect I got a duff one.

And thats cool, improved charge cycles. I will try to get the green ones in future then, but if I can't I won't lose sleep over it.

 

[Mike H.]

My bad...i read hE2 for some reason...Yea the HG2 is 3000mah and supposed to still be a 20 amp continuous rating...I havent tried one of those yet but, plan to.

 

[cascadian]

I love the HG2 batteries but they are touchy about usage. With any INR battery, observing the rest periods post charge and discharge to let the battery reach room temperature is important. But the HG2 seems to absolutely require it or you will experience a decrease in capacity and cycle life almost immediately. When handled and used per the data sheet recommendations the HG2 is my preferred battery for regulated devices at 60W per cell or below. I would never use or recommend them for a device with on board charging as a true rest period is impossible under those conditions.

 

[MercuryVaper]

I have both batteries, the blue 25r's and the new brown he2 3000mah. I got the lg's thinking it would give better run times in my new Sigelei 75tc. They do, but marginally. That Sigelei, no matter what battery I've tried will give the check batt at around 3.5v. It can be kinda annoying, but it is what it is. Not sure if it's a defect, but I doubt it is because seems they all do this. So I'm thinking they designed it to do this, to save the battery and give it longer life span, maybe.

 

[NemesisVaper]

Not had an issue with my pair if HG2. U can use my Sigelei 100W all the way down till it says 8% before it refuses to fire. That's with it set to 70W.

There won't be much capacity improvement over the common 2500mAh cells. They all achieve their rated capacity in a discharge from 4.2V to 2.5V. The HG2 needs to be taken down to 2.0V to achieve 3000mah. A bug chunk of the extra 500mah will be at the point between 2.5V and 2V. We never discharge them that low, so won't see a huge gain. I'm guessing 200mAh maybe less.

I won't be buying any more. Not worth the premium over 25R in my opinion.

 

[cascadian]

The HG2 needs to be taken down to 2.0V to achieve 3000mah.

Ummm. No they don't. They need to be discharged to 2.5V at no more than a 10A rate.
http://keeppower.com.ua/download/2015-06/datasheet-LG_INR18650HG2-1.pdf

 

[Jon@LiionWholesale]

Not had an issue with my pair if HG2. U can use my Sigelei 100W all the way down till it says 8% before it refuses to fire. That's with it set to 70W.

There won't be much capacity improvement over the common 2500mAh cells. They all achieve their rated capacity in a discharge from 4.2V to 2.5V. The HG2 needs to be taken down to 2.0V to achieve 3000mah. A bug chunk of the extra 500mah will be at the point between 2.5V and 2V. We never discharge them that low, so won't see a huge gain. I'm guessing 200mAh maybe less.

I won't be buying any more. Not worth the premium over 25R in my opinion.

Running at 20A to 2.5V we get 2850mAh on the HG2 and 2450mAh on the 25R so that's pretty significant.

 

[cascadian]

Running at 20A to 2.5V we get 2850mAh on the HG2 and 2450mAh on the 25R so that's pretty significant.

Have you or have you thought about running a capacity test with a low voltage cut off more similar to a regulated mod? ie 3 - 3.4V... It would be very beneficial to the community instead of non scientific comparisons or trying to interpret discharge curves for the few batteries that you can find them for.

 

[NemesisVaper]

Running at 20A to 2.5V we get 2850mAh on the HG2 and 2450mAh on the 25R so that's pretty significant.

A bit better than I thought then. I'm surprised there wasn't more capacity trapped below 2.5V.

Would you be up for discharging one all the way down to 2.0V as per the spec sheet? I'd be interested to see the capacity that's there.

 

[NemesisVaper]

Ummm. No they don't. They need to be discharged to 2.5V at no more than a 10A rate.
http://keeppower.com.ua/download/2015-06/datasheet-LG_INR18650HG2-1.pdf

The pdf you linked to has both 10A and 20A fast discharge listed, so 20A is covered. The cutoff voltage is different to the spec sheet I've seen. It's also different to the one batterybro.com is using. It would be interesting to see the revision date on the ones stating 2.0V, because there are spec sheets out there that do. Maybe one of them is a later revision of the spec. Entirely possible the cell wasn't performing as planned so they dropped the cutoff to increase capacity.

 

[Jon@LiionWholesale]

Have you or have you thought about running a capacity test with a low voltage cut off more similar to a regulated mod? ie 3 - 3.4V... It would be very beneficial to the community instead of non scientific comparisons or trying to interpret discharge curves for the few batteries that you can find them for.

Well the cool thing about running it lower is you can simply read the graph to see what they would be at a higher cutoff voltage.

So at 3V, 15-20A:
25R: 2000mAh
HG2: 2400mAh

3.2V, 20A:
25R: 1200mAh
HG2: 1300mAh

3.2V, 15A:
25R: 1520mAh
HG2: 1750mAh

3.4V is a pretty useless test at 20A because it pretty much immediately sags to 3.5-3.6. At lower amperages it'd be much more useful.

 

[Jon@LiionWholesale]

A bit better than I thought then. I'm surprised there wasn't more capacity trapped below 2.5V.

Would you be up for discharging one all the way down to 2.0V as per the spec sheet? I'd be interested to see the capacity that's there.

I would but unfortunately we've got some people going out of the office (including myself) so for the next couple weeks. Plus I want to look into the conflicting spec sheets before doing that, don't want to go below the minimum voltage. So I can do it but it'll be mid-Sept.

Based on what the curve looks like there I'd guess you'll get another 50 or 100 mAh, maybe 150.

 

[NemesisVaper]

I would but unfortunately we've got some people going out of the office (including myself) so for the next couple weeks. Plus I want to look into the conflicting spec sheets before doing that, don't want to go below the minimum voltage. So I can do it but it'll be mid-Sept.

Based on what the curve looks like there I'd guess you'll get another 50 or 100 mAh, maybe 150.

That's cool mate, no problem. I haven't got round to contacting batterybro.com yet to see if he can send me the sheet he took the screen grab from. Definitely wise to be careful, don't want any mishaps.