ni-mh batteries

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kwalka

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I survived 14 days without electricity and 10 days without running water (thank you Nation Guards everywhere) in 2005 after the devistation of hurricane Rita, lesser known hurricane that hit Louisiana that year. This would have been nice...

Well luckily I was just trolling for misc box mod parts when I came across this excellent invention. So next time you or anybody find them selves in said precarious situation, you may have to go w/o food, water, and most basic creature comforts, but you however will not experience nic withdrawls.

On a serious note, there is nothing funny about people losing there homes or even worse. So I felt it necessary just to throw that out there.
 

WillyB

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If you can find the Duracell 15 minute fast charger, GET ONE ! :D You can find one online. I have one and there's 4 slots for batteries. It really does only take 15 minutes or so to charge all 4 batteries (or 3 or 2) at once. Well worth the money! Duracell 15-Minute Charger and AA NiMH Batteries, 4/pk
I got mine at a local office supply. Amazon has them as well. It will charge any brand of ""Rechargeable" AA or AAA size ( duracell, energizer etc.). I'm not sure if you have them locally or not in England :confused: I LOVE mine :)
:)

Never have I seen so many negative reviews for a product.

Amazon.com: Duracell 15 Minute Battery Charger

This is a typical dumb charger. You want chargers that use Negative Delta V to determine cut off, not "15 minutes guaranteed".

Folks would do well to buy themselves a 'smart charger', many chargers out there simply use a timer and cook the cells for a predetermined time, regardless of the voltage. Smart chargers will have 4 independent channels, monitor each cell, and can charge one cell at a time.

I have no idea as to the quality of this one, but it has all the right specs.

CH-V3150 Smart Compact Charger for NiMH Battery - AC 110-240V -Direct plug

Folks using NiMH should note that some brands work better than others and a four pack is not exactly LR capable.

Here's a LOADED volts test of 4 AAs @ 2Ω. They came off the charger at 5.5V.

4AA_2_ohm_.jpg


Note in an actual mod the volts will be a tad lower.
 

kwalka

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WillyB, Thanks for that. I knew this seemed too good to be true. Batts that last twice as long and take 10% of the charge time..... Anyway definetly sounds like its worth getting the smart charger. So answer me this, if possible, if I have the Duracell NiMh charger that came w the batts, and it takes like 4 hrs to charge 4 AA batts, also gets a green light every time, does that mean its a safe charger? I did put a couple of my aaa on the meter the other day and they were reading like a whole volt higher than they should of been, if memory serves me.
 

pfaber11

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i am going to keep vaping on these batteries until they are completely flat i read somewhere these types of cells are prone to the memory effect . i only paid 3.99 for 4 which is cool and they came charged which is an added bonus . gonna buy some more soon as i use six at a time. tried using four and five but just wasn't getting the kick i was after.
 

pfaber11

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hey that's pretty good on the packet it said can be recharged upto 1000 times so should get a year out of them. i have not bought any propriety batteries since i got my starter kit about 3 years ago. been using my home made usb pass thru which will probably last forever with the odd service. great to be mobile again and not tied to a computer or walk socket.
 

AG51

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I don't know how long they'll actually last, probably varies quite a bit. But I'm happy they lasted this long already ! :laugh: I did try using the regular Duracell AA batteries (not the rechargeable kind) to see how long they'd last for emergency,( like traveling and forgetting a charger ya know ? ) and I got 7 hours out of them one time and 5 hours vape out of them another time, before I had to throw them out. (They weren't very high mah) Which I thought was pretty cool too :D
 

pfaber11

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i am just testing my batteries out now, i charged them for 5 hours and have been using them for 5 hours . i am only using 800 mah so i suppose he i were using 2400 i would be looking at over 15 hours . i am a heavy vapor and am quite happy with my equipment i used to get about an hour to an hour and a half out of my 801 batteries as far as i remember and they packed in after a month or so so i took the insides out of them and turned them into usb pass thrus .
 

Stosh

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WillyB's numbers are a bit misleading, with a 2 ohm load and "fresh off the charger batteries"?? your results would be calculated....
Also proves good quality NiMh batteries work better.

6z4vu8.jpg


So if you're interested in vaping over 14 watts, drawing over 2.5 amps, there may be some dropoff. With most high voltage Li-ion mods, they have problems with over 2.5 amps, like a provari for example. Regular protected Li-ion may also trip the protection circuit. Many voltage regulators won't handle the amperage.

Fibbing with statistics is so easy, Willy should go into politics.....:)
 

johnpencraig

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Here's my multimeter picture, which tells a different story to WillyB's.
Preliminary info - I don't use a Puck at present, although I did have one last year, and had no drastic drain problems. I've got no more than basic electrical knowledge. The test is on a ratty lash-up with more resistance in the circuit than is desirable.
Atty is an RDA with a 2.4ohm coil, closer to the puck norm than WillyB's 2 ohm test.
Decent batteries are used - Sanyo eneloop. WillyB's pack looks like it has an odd cell.

Fresh charged, the batteries read 5.87 with no load. I activated the atty half a dozen times, to take off the initial bloom.
Test reading without load was 5.76v. Under the 2.4ohm load, it was 5.14v.
This gives figures of 11w and 2.15a
Obviously the voltage declines from here on in, like any unregulated supply, but there'll be no plummet to the levels of WillyB's picture.


DSCN1295_copy.jpg
 

pfaber11

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well the batteries finally ran out after 7 hours and 20 minutes. this is after a five hour charge. its good enough for me and way better than the stock batteries . the chargers i bought were a disappointment though ,you would think they would do something when the batteries were full but they just stay on red . they were different makes too.oh well spent my money now and don't want or need three chargers. i am ready for a power cut now.
 

AG51

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well the batteries finally ran out after 7 hours and 20 minutes. this is after a five hour charge. its good enough for me and way better than the stock batteries . the chargers i bought were a disappointment though ,you would think they would do something when the batteries were full but they just stay on red . they were different makes too.oh well spent my money now and don't want or need three chargers. i am ready for a power cut now.
Hey, 7 hours + 20 minutes for a heavy vaping person is nothing to sneeze at. That's pretty good for inexpensive batteries :) I don't understand why your chargers are working that way so I can't help you there :( You did say though they were 800 mah batteries right ? Some where I read as a 'loose rule of thumb' that you get roughly 1 hour of vape time per every 100 mah. IF that's true, you were pretty close to the money for heavy vaping. 800 mah would be equal to somewhere up to 8 hours? You got 7 good hours there. I'd say you did well if that's the case.
 

WillyB

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WillyB's numbers are a bit misleading, with a 2 ohm load and "fresh off the charger batteries"?? your results would be calculated....
Also proves good quality NiMh batteries work better.

6z4vu8.jpg


So if you're interested in vaping over 14 watts, drawing over 2.5 amps, there may be some dropoff. With most high voltage Li-ion mods, they have problems with over 2.5 amps, like a provari for example. Regular protected Li-ion may also trip the protection circuit. Many voltage regulators won't handle the amperage.

Fibbing with statistics is so easy, Willy should go into politics.....:)
I do a proper test with a 2Ω load and you try to dispute it with some formula thing using some voltage you plunked out of thin air? LOL

I post an actual loaded volts test, which call misleading and fibbing, and then you counter with some Ohm's Law calculator picture? LOL. Get real, do you even understand how batteries even work, or the concept of loaded volts?

I suppose you think the watts under a given load would be the same with a 10440 and a 26650 because your little calculator thingy says so using their identical nominal voltage?

It's intersting how you chose 5.3V to base your calculation on. Many of the cheap chargers struggle to fully charge the cells.

Regarding the recommended Duracell 15 minute charger here's an interesting tidbit from their site.

Recharge your batteries in a flash with the 15-Minute Charger—your batteries will be ready* in 15 minutes, guaranteed.

*Approx 75% of full charge, when using Duracell 1700 mAh AA or 750 mAh AAA NiMH batteries.

Why don't you post an actual loaded volts test instead of the drivel you chose to present?

For someone who has been around as long as you it's rather amazing how little you actually understand. It's rather sad.

"Fibbing with statistics", LOL. How an honest, actual test can be called "statistics" is also beyond comprehension. I can only assume that English is not your native language.

Seems Stosh needs to do a little research and buy himself a dictionary, or at least find a new nanny.


Here's my multimeter picture, which tells a different story to WillyB's.
Preliminary info - I don't use a Puck at present, although I did have one last year, and had no drastic drain problems. I've got no more than basic electrical knowledge. The test is on a ratty lash-up with more resistance in the circuit than is desirable.
Atty is an RDA with a 2.4ohm coil, closer to the puck norm than WillyB's 2 ohm test.
Decent batteries are used - Sanyo eneloop. WillyB's pack looks like it has an odd cell.

Fresh charged, the batteries read 5.87 with no load. I activated the atty half a dozen times, to take off the initial bloom.
Test reading without load was 5.76v. Under the 2.4ohm load, it was 5.14v.
This gives figures of 11w and 2.15a
Obviously the voltage declines from here on in, like any unregulated supply, but there'll be no plummet to the levels of WillyB's picture.

Interesting, you have a pack that's charged to higher voltage and you are using a significantly lighter load. Ever heard the saying 'comparing apples and oranges"?

You did note that I said some batteries are better than others. I also have a feeling that most will be buying cheap dumb chargers and batteries.

How about a few tests by Chezzy from the UK.

As I said I would do, I've got around to taking some photos of the Nimh mod with different batteries, both unloaded and under load. I've used a boge 2.7ohm cartomizer and a 1.8ohm triple coil cartomizer.

First are 1.2v 1000mah Duracell Supreme Nimh rechargeable batteries. The first image in the photo is unloaded, the second image is with the boge 2.7om and the third with the 1.8 triple coil. If you can't make out the images the values are 5.6v, 4.6v and 4.02v.


nimh-mod-Duracell-Supreme.jpg



Next are my 1.2v 900mah Digimax low self discharge Nimh rechargeable batteries. Values 5.2v, 4.17v, 3.64v.

nimh-mod-Digimax.jpg


Seems his numbers are very much in line with mine. If we average his two 1.8Ω tests we get 3.83V. Seems quite similar to the 'plummet levels' in my test.

The Puck was built around a 3+Ω 901 atty. In the thread a number of folks started posting low LOADED voltage, ~3.6V or so when using Joye 510s. All sorts of suggestions as to check the wiring etc. Folks were fumbling around, checking this and that, assuming they had done something wrong. That's when I did my quick test to see what is going on.

They were doing nothing wrong. Not many folks use 3+Ω atties, 'the Puck norm' these days.

My test and Chezzy's tests show, that if you are planning on using the very popular lower res atties/cartos you may very well be disappointed with the results.

That said seems the OP has avoided any such disappointment.

... when i first put this together i tried it with three batteries then four and then to six. six gives an excellent vape and is way better than the original 801 batteries
 
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