NiZn AAA Batteries - Just received - Testing them

58 posts / 0 new
Last post

Pages

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA
NiZn AAA Batteries - Just received - Testing them

I just received 4 UltraCell AAA NiZn batteries from GreenForceCells
GreenForce UltraCells

The advertised capacity is about 700mAh (1145 mWh converted). However, so far in my test and in HKJ’s tests, they fall far short of that.
Interesting to note that PowerGenix 1.6v AAA batteries are advertised as 900mWh or 560mAh. Probably closer to an honest rating.

They all were sitting at 1.68v when they arrived and I thought “Hey, that’s good”…they were all alive and all had a reasonably good charge on them.

I’m running discharge tests on them now. The test is at .5 amp current down to 1.2v
They drop from about 1.9v to 1.65v VERY rapidly once I start the discharge cycle. (less than 60 seconds).

I’m using a fully regulated DC Power Supply to charge them (CC/CV).
The good thing about the DC power supply is that it automatically decreases the current as the battery reaches the preset voltage so overcharging is not a concern. REALLY handy on that.

So far here are my results …
Round 1 – (charged to 1.9v at 200mA, discharged to 1.2v at 500mA)
Cycle 1 – 150mAh
Cycle 2 – 340mAh
Cycle 3 – 479mAh
Cycle 4 – 475mAh
Cycle 5 – 461mAh

Round 2 – (charged to 1.8v at 110mA, discharged to 1.2v at 100mA)
Cycle 1 – 490mAh

I would consider 600mAh as success with these….but that aint happening.
It does seem the capacity is improving a lot with each cycle. By the 4th or 5th cycle I’ll probably know where they’re going.
My hope is to use these in my various automotive alarm remotes for my cars, vans and motorcycles.. That’s why I bought them.
But I also have some CREE flashlights I could use them in and my new 700lm dual LED headlamp.

For discharging, I’m using a Turnigy Accucell 6 and discharging them at .5amps with a pre set cut off at 1.2v
The hobby charger is set to NiCd for the discharge but I don’t think that matters on the discharge cycle.

After I’ve cycled them 5 times I’ll post back the capacity results.

Edited by: Zebretta on 01/19/2017 - 23:56
Lexel
Lexel's picture
Online
Last seen: 16 min 8 sec ago
Joined: 11/01/2016 - 08:00
Posts: 3147
Location: Germany

old imax B6 have a problem on lithium discharge not lowering the current at the end of the cycle, so often people use NiCd with the cutoff voltage you want

the cells are charged CC CV, so put on a DC power supply is an option to charge em

[Reviews] Miboxer C4-12, C2-4k+6k, C2, C4 / Astrolux K1, MF01, S42, K01 / BLF Q8 / Kalrus G35, XT11GT / Nitefox UT20 / Sofirn SF36, SP35 / Imalent DM21TW / Wuben I333 / Ravemen PR1200 / CL06 lantern / Xanes headlamp

[Mods] Skilhunt H03 short / Klarus XT11GT, XT12GTS / Zebralight SC50+Imalent DM21TWcolorful anodisation

[Sale] TA drivers Narsil or Bistro / Remote switch tail DD board with FET

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA

Thanks. The capacity seems to be bouncing back nicely so far. Hoping for a good outcome.

HKJ
HKJ's picture
Offline
Last seen: 3 hours 55 min ago
Joined: 05/24/2011 - 12:23
Posts: 5557
Location: Copenhagen, Denmark
Zebretta wrote:
Thanks. The capacity seems to be bouncing back nicely so far. Hoping for a good outcome.

I tested them (Or some other generation of them) some time ago and was not very impressed with the capacity: http://lygte-info.dk/review/batteries2012/UltraCell%20NiZn%20AAA%201150mWh%20(Blue)%20UK.html)%20UK.html

My website with reviews of many chargers and batteries (More than 1000): http://lygte-info.dk/

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA
HKJ wrote:
Zebretta wrote:
Thanks. The capacity seems to be bouncing back nicely so far. Hoping for a good outcome.

I tested them (Or some other generation of them) some time ago and was not very impressed with the capacity: http://lygte-info.dk/review/batteries2012/UltraCell%20NiZn%20AAA%201150m...(Blue)%20UK.html

I saw your review and kinda hoped maybe they had improved over time. In your test, the best capacity result was only 475mAh when charged at 100milliamps. My results seem to be about the same with the “UltraCells” I received yesterday.
Your test results always seem to be very accurate.

From your charts, it appears your cutoff voltage was 1.1v whereas I used 1.2v for the cutoff voltage in my tests. I think the difference probably would have only been about 5mAh anyway because the voltage on these drops really fast once below 1.3v

PowerGenix AAA NiZn’s are “honestly” rated at 900mWh which is about 560mAh….so that is close to what I’m getting with Ultracells. I think I’ll achieve that on the ones I received by the 5th cycle…or close.

Kentli AAA cells are $7.50 PER CELL (lowest price I could find). More than I care to spend on AAA’s

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA

Cycle 4 and 5 seem to have gone the wrong direction…..

03 minutes – 25mAh – 1.60v
10 minutes – 82mAh – 1.54v
15 minutes – 124mAh – 1.64v
20 minutes – 166mAh – 1.65v
25 minutes – 207mAh – 1.64v
30 minutes – 249mAh – 1.63v
35 minutes – 291mAh – 1.61v
40 minutes – 332mAh – 1.58v
45 minutes – 374mAh – 1.53v
50 minutes – 415mAh – 1.44v
55 minutes – 457mAh – 1.23v
57 minutes – 461mAh – 1.20v

Not sure why. Charging anomoly ? I’m pretty sure I charged them the same each time but then with a CC / CV charger it’s possible to be off 50-100mAh maybe.

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA

To anyone considering purchasing these cells…..I can’t recommend them….EXCEPT…..
In a VERY low drain application where the device has a built in discharge voltage cut off of 1.2v or higher.
In that particular application, the higher voltage of these batteries could be a perfect fit.

They are losing capacity with each cycle when charged to 1.9v and discharged at 500mAh to 1.2v.
The ones tested above are now only reaching 445mAh after just 5 or 6 cycles.
They are dropping in capacity fairly quickly. Again, they were charged to 1.9v on a CC/CV stable DC power supply and never discharged below 1.2v
I am adjusting the charge maximum voltage to 1.8v and 100mA charge current and adjusting the test discharge current to only 100mA

Maybe the PowerGenix cells are better quality?

Ironically, there are people who bought them on ebay and commented they are quite pleased with them.
I would assume those are people who don’t test their capacity.

I can’t see these as a good fit in most flashlights or any high current drain app or any device without a 1.2v or higher built in discharge cut off.

Tinderbox UK
Tinderbox UK's picture
Offline
Last seen: 2 weeks 2 days ago
Joined: 12/26/2016 - 06:17
Posts: 298
Location: England, United Kingdom

I bought the same cells months ago, They have to be charged gently and not discharged as low as possible, even so one of my cells died within the first week, I stopped using the cells.

 

I read this thread a couple of day`s ago but i could not remember what capacity i was getting, so i have put my cells though a refresh on my mc3000, And will post the results when they finish.

 

EDIT: My 3 AAA NiZn cells, 421mah, 412mah, 414mah

 

These NiZn cells are a waste of time really and i am glad i did not pay a lot for them, And would not buy them again.

 

John.

 

 

SkyRC MC3000 – Maha C9000 – LaCrosse BC-900 – Floureon BT-C3100 V2.2 – Accumanger 10 and 20 -Thunder AC6 LiitoKala Lii-100 – Cozypony 24W Solar Panel – Soshine H4 – Soshine T2 – Soshine E4S

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA
Tinderbox UK wrote:
I bought the same cells months ago, They have to be charged gently and not discharged as low as possible, even so one of my cells died within the first week, I stopped using the cells.

I read this thread a couple of day`s ago but i could not remember what capacity i was getting, so i have put my cells though a refresh on my mc3000, And will post the results when they finish.

These NiZn cells are a waste of time really and i am glad i did not pay a lot for them, And would not buy them again.

John.

Thanks John.
Did you ever try the PowerGenix AAA NiZn cells?
I wonder if it’s the exact same cell…..different wrapper?

I have two more of these that I have not yet “cycled”
I think I will lower the final charge voltage to 1.8v instead of 1.9v and see if that makes any difference.
The charge current has only been 100 – 300milliamps. Mostly around 150milliamps
I will limit charge current to 100 milliamps for the other two.

And because I intended to use these in VERY low drain devices that have a built in cutoff voltage of 1.3v I will limit discharge current to 100 milliamps also.

They still “might” work fine for the purpose I want them for.

Tinderbox UK
Tinderbox UK's picture
Offline
Last seen: 2 weeks 2 days ago
Joined: 12/26/2016 - 06:17
Posts: 298
Location: England, United Kingdom

I have only used the UltraCell NiZn, I bought them to use them in my old Sony mp3 player it takes an single AAA alkaline, I tried NiMh but the battery gauge only shows 3 of 4 bars when the NiZn shows all 4 bars, I think that`s what killed my first NiZn i forgot to remove the battery when i was not using it for a week and it went flat, the NiZn would not charge after that.

 

John.

SkyRC MC3000 – Maha C9000 – LaCrosse BC-900 – Floureon BT-C3100 V2.2 – Accumanger 10 and 20 -Thunder AC6 LiitoKala Lii-100 – Cozypony 24W Solar Panel – Soshine H4 – Soshine T2 – Soshine E4S

sac02
sac02's picture
Offline
Last seen: 3 weeks 3 days ago
Joined: 09/26/2016 - 15:18
Posts: 710
Location: TX

I did a quick google search wondering what the advantages of NiZn batteries were (summary: not much – a tiny bit of extra voltage when fresh off the charger, and “theoretically” higher discharge capacity if you believe the marketing materials).

But self discharge is high, and reliability seems to be a MAJOR issue with NiZn – users report time and time again that many of their NiZn batts (like 50, 80, even 100%) are dead and useless (like 30mAh capacity) after a year of only 10 or 15 cycles total.

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA

sac02 wrote:
I did a quick google search wondering what the advantages of NiZn batteries were (summary: not much – a tiny bit of extra voltage when fresh off the charger, and “theoretically” higher discharge capacity if you believe the marketing materials).

But self discharge is high, and reliability seems to be a MAJOR issue with NiZn – users report time and time again that many of their NiZn batts (like 50, 80, even 100%) are dead and useless (like 30mAh capacity) after a year of only 10 or 15 cycles total.

I’m trying mine in my alarm remotes which only draw .5mA current.
Even at just 400mAh capacity, I calculate they should power it for a month. That’s about what I get out of alkalines in them.
I’m using them in the remotes now to get the real world results but it will be about a month (or less)

At this point, I really believe they have to be VERY gingerly charged (like 100mAh current and only charged to 1.8v (not 1.9)
Then, they can’t be used in a high drain application. They are just not able to handle any stress it seems.
Also, any application that does not have a built in discharge voltage cut off will end in a dead cell.

I think there is a perfect use for these in 1.5v devices that draw VERY low current AND have a built in discharge voltage cut off of 1.2v or higher.

I will know in about a month.

I think HKJ (or somewhere it was said) that these cells can take a fairly high rate of charge.
That hasn’t been my experience. They seem VERY fragile and need low low rates of charge and discharge.

The NiZn chargers that most people use probably damage the batteries if the current is over 100mAh.
I don’t see 1amp charge on these batteries. I used 500mA and the capacity is down.
Maybe it was charging them to 1.9v? Maybe they’re just garbage inside?

sac02
sac02's picture
Offline
Last seen: 3 weeks 3 days ago
Joined: 09/26/2016 - 15:18
Posts: 710
Location: TX

Needing to handle them with such care and special regimens would hardly seem to make it worthwhile except in extrememly limited use scenarios. (Why can’t you just use NiMH in your remotes, do they specifically need the 1.5V?) Especially when part of the advertised advantage was supposedly that they were better for high drain devices.

As you said in the last few words above, I also wonder how much of the problems are:
1. inherent to the engineering/design/chemistry of the cells, and
2. simply shoddy manufacturing.

The fact that some cells survive but many die indicates problems with manufacturing, but the fact that no other company seems to be interested in the NiZn chemistry also tells me there may be issues with item 1.

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA

The alarm remotes I use only run about 5 days on even the very best NiMh batteries because of the cut off voltage of 1.34v.
The NiMh batteries drop voltage rather quickly compared to the NiZn’s

The NiZns are pretty darn good at holding voltage ABOVE 1.3v for a much longer time it appears. Significantly longer.
They are similar to Alkalines in terms of time vs voltage drop.

For some reason, they like to hover between 1.5v and 1.6v for a very long time, then drop sharply once below 1.4v.

This is ideal for my low current devices that need voltage above 1.34 but can tolerate voltages as high as 1.8v.

For me charging them is no more complex than any battery charger. I pop them into a AAA cradle connected to my CC/CV DC power supply and go.

Tinderbox UK
Tinderbox UK's picture
Offline
Last seen: 2 weeks 2 days ago
Joined: 12/26/2016 - 06:17
Posts: 298
Location: England, United Kingdom

Has anybody tried the li-ion AAA cells that have an micro usb built in to charge them, They are regulated to 1.5v but what capacity are they.

 

I have a pack of 4 but i have not done any tests on them.

 

John.

SkyRC MC3000 – Maha C9000 – LaCrosse BC-900 – Floureon BT-C3100 V2.2 – Accumanger 10 and 20 -Thunder AC6 LiitoKala Lii-100 – Cozypony 24W Solar Panel – Soshine H4 – Soshine T2 – Soshine E4S

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA

Tinderbox UK wrote:
Has anybody tried the li-ion AAA cells that have an micro usb built in to charge them, They are regulated to 1.5v but what capacity are they.

I have a pack of 4 but i have not done any tests on them.

John.

Havent seen those. Have a link?
I’m interested in Kentli batteries.
They are LiPo inside I believe but are usually around $9.00 PER CELL (Yow!!)

Tinderbox UK
Tinderbox UK's picture
Offline
Last seen: 2 weeks 2 days ago
Joined: 12/26/2016 - 06:17
Posts: 298
Location: England, United Kingdom

I have the ZNTER AAA 400mah 4.25v 1.5v written on them.

 

http://www.banggood.com/ZNTER-S17-1_5V-400mAh-USB-Rechargeable-AAA-Lipo-...

 

EDIT: I think i tried to do a capacity test when i got them, but the low voltage protection must have kicked in so i lost the capacity information.

 

John.

SkyRC MC3000 – Maha C9000 – LaCrosse BC-900 – Floureon BT-C3100 V2.2 – Accumanger 10 and 20 -Thunder AC6 LiitoKala Lii-100 – Cozypony 24W Solar Panel – Soshine H4 – Soshine T2 – Soshine E4S

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA

I got 490mAh out of one of the test AAA’s by charging it at 100mAh and discharging it at 100mAh.

I’m not knowledgeable on how the lower discharge rate affects the discharge capacity results.

But…..it appears that with 490 mAh, I can run my intended devices for a month or more. That’s more than enough to suit my needs for these batteries.

If they run the devices 2 weeks and 1 day I’ll be satisfied. Thrilled if they can run it for a month.

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA

Just found another potentially stellar use for NiZn batteries.

Smoke detectors / CO detectors

Mine started beeping today. It had top quality Alkalines in it. The cut ouff (warning beep) voltage was 1.46v (I have no idea why so high, but that’s what it is)

In my book, alkalines have a LOT more life at 1.46v, but for some reason maybe smoke detectors have a high voltage threshold.

Anyway, this seems to be yet another superb application for NiZn batts. Just ordered a batch of PowerGenix AA’s for this application.

My only concern is that it uses multiple AA’s (3) and so the initial voltage will be 5.4v instead of 4.6v (ish)

But I’m fairly sure it will handle that difference ok.

Tinderbox UK
Tinderbox UK's picture
Offline
Last seen: 2 weeks 2 days ago
Joined: 12/26/2016 - 06:17
Posts: 298
Location: England, United Kingdom

 I wonder if those Batteriser/Batteroo AA adapter sleeves would work they put out a constant 1.5v at low current, HKJ did a review of them a week or two ago and said they might  be of use in certain circumstances.

 

John.

SkyRC MC3000 – Maha C9000 – LaCrosse BC-900 – Floureon BT-C3100 V2.2 – Accumanger 10 and 20 -Thunder AC6 LiitoKala Lii-100 – Cozypony 24W Solar Panel – Soshine H4 – Soshine T2 – Soshine E4S

flydiver
Offline
Last seen: 1 hour 35 min ago
Joined: 06/19/2013 - 19:16
Posts: 743
Location: Seattle, WA

You got some odd smoke detectors.
I’ve got a 9v one running fine on 8.4v li-on. Get 6 months+ before charge is needed. Completely useless to use NiMh 9v, last a couple weeks.

Don’t think the discharge character of NiZn will work all that well with the application unless you don’t mind pulling and charging them on a routine basis.

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA

flydiver wrote:
You got some odd smoke detectors.
I’ve got a 9v one running fine on 8.4v li-on. Get 6 months+ before charge is needed. Completely useless to use NiMh 9v, last a couple weeks.

Don’t think the discharge character of NiZn will work all that well with the application unless you don’t mind pulling and charging them on a routine basis.

I’ll have to test them and see. The same was said about the use I have for my NiZn AAA’s in the alarm remotes (similar circumstances) and so far they are doing very well. 2 weeks in they are at 1.63v I feel certain they will at least make 2 more weeks (if I don’t keep pulling them to check voltage which uses a burst of power when the battery is replaced and the device re-initializes. 4 weeks would be about as good as the best Alkalines I’ve tried. Except the NiZn’s are rechargeable.

With 3 AA’s in the smoke detector, the run time with the NiZn’s should be more than adequate.

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA
Tinderbox UK wrote:

 I wonder if those Batteriser/Batteroo AA adapter sleeves would work they put out a constant 1.5v at low current, HKJ did a review of them a week or two ago and said they might  be of use in certain circumstances.


 


John.

These devices work only with disposable batteries. Not rechargeables IIRC..

Unless I’m mistaken, these sleeves contain “Joule Thief” circuitry. Please let me know if that is wrong.

I have not had a chance to test them against rechargeable batteries and while they might maintain voltage…I wonder about maintaining current and if the devices I’m using the NiZn’s in would be compatible with the Batteroo sleeves. Dunno. But I’m also moving away from disposable batteries

Tinderbox UK
Tinderbox UK's picture
Offline
Last seen: 2 weeks 2 days ago
Joined: 12/26/2016 - 06:17
Posts: 298
Location: England, United Kingdom

It should work great for 1.2v nimh cells as the low voltage will be boosted to 1.5v but only for low drain devices, smoke alarms don't use a lot of power.

 

Read the review below.

 

http://www.candlepowerforums.com/vb/showthread.php?428675-Test-review-of-Batteroo-AA-with-a-Duracell-battery

 

John.

SkyRC MC3000 – Maha C9000 – LaCrosse BC-900 – Floureon BT-C3100 V2.2 – Accumanger 10 and 20 -Thunder AC6 LiitoKala Lii-100 – Cozypony 24W Solar Panel – Soshine H4 – Soshine T2 – Soshine E4S

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA

Tinderbox UK wrote:
It should work great for 1.2v nimh cells as the low voltage will be boosted to 1.5v but only for low drain devices, smoke alarms don’t use a lot of power.

Read the review below.

http://www.candlepowerforums.com/vb/showthread.php?428675-Test-review-of-Batteroo-AA-with-a-Duracell-battery

His review conclusion didn’t seem overly optimistic.
Conclusion

_The sleeve is not really a product to save a lot of batteries with, there are probably a few products where it will increase the runtime for batteries, if it can fit in them (Many devices has a fairly tight fit on batteries).
With some devices there is also a risk that either the ripple or the switcher noise will prevent them from working correctly.
Due to the nearly constant output voltage until the battery is empty, battery meters will not really work when using this device.

To find devices where it might be useful, look for devices that have very short runtime with NiMH batteries and considerable longer with alkaline. The sleeve might be more useful with NiMH batteries than with alkaline. The question is how hard the 0.6V minimum will affect lifetime of NiMH.

As a general device to extend battery life it is not very useful, but in a very few situations it might be a useable solution._”
.
.
.
Then I saw this thread…..
Batteroo

It’s an interesting idea, but the real benefits don’t seem as great as advertised and I don’t want to risk damage to my rechargeables.

Ginseng
Offline
Last seen: 10 months 13 hours ago
Joined: 01/29/2017 - 22:26
Posts: 28
Location: NoVa
sac02 wrote:
…reliability seems to be a MAJOR issue with NiZn – users report time and time again that many of their NiZn batts (like 50, 80, even 100%) are dead and useless (like 30mAh capacity) after a year of only 10 or 15 cycles total.

This is exactly my experience. I bought 8 of the Genix AA batteries for use in my Nikon Speedlights. Sets of four went in at a time. Within half a year of moderate use, weekends, 5 of them had gone stone dead. I chucked the rest and went back to old reliable NiMH. When they were working, they really kept the flash cycle time short. But the early death and high failure rate makes them a complete non-starter in precisely those applications where their characteristics would be advantageous.
Wilkey

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA
Ginseng wrote:
sac02 wrote:
…reliability seems to be a MAJOR issue with NiZn – users report time and time again that many of their NiZn batts (like 50, 80, even 100%) are dead and useless (like 30mAh capacity) after a year of only 10 or 15 cycles total.

This is exactly my experience. I bought 8 of the Genix AA batteries for use in my Nikon Speedlights. Sets of four went in at a time. Within half a year of moderate use, weekends, 5 of them had gone stone dead. I chucked the rest and went back to old reliable NiMH. When they were working, they really kept the flash cycle time short. But the early death and high failure rate makes them a complete non-starter in precisely those applications where their characteristics would be advantageous.
Wilkey

They’re not ideal in some applications. Yours probably being one of them. The loaded voltage in your application may have constantly dipped well into the danger zone for NiZn’s.

I think you have to consider the application. I don’t personally think NiZn’s are suitable for high drain applications….meaning greater than about maybe 500mA
They are also apparently very susceptible to overcharge and undercharge. Most folks recommend charging to 1.9v. I don’t. I only charge mine to 1.8v
On the opposite end, I use them exclusively in devices that have a voltage cut off point at or above 1.2v (or at least a low voltage warning).
NiZn’s seem to be ruined if they go much below that so I never risk it. So far they are working great in my low drain devices that have a built in voltage cut off.

That said, it’s early in the game for my NiZn’s. I did read where someone here has been using them for over a year and they’re still going strong with quite a few cycles on them. I think your camera might be too high drain for them.
I think they are niche batteries that fit a very narrow application scope…..low to very low drain, requiring 1.5v but tolerant of up to 1.8v and protected from draining below ~1.2v

I use them in my alarm remotes and they are right at 3 weeks now and still showing full power on the remote’s meter. I checked the votage yesterday and they were at 1.60v so I’m confident they will easily make it one more week. I could not get 4 weeks out of NiMh’s simply because the cut off voltage for these remotes is 1.3v.

The NiZn’s “seem” to be the Golden Ticket to power these remotes so far.

Of course, these are all unscientific opinions and observations so definitely take them with a grain of salt

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA

flydiver wrote:
You got some odd smoke detectors.
I’ve got a 9v one running fine on 8.4v li-on. Get 6 months+ before charge is needed. Completely useless to use NiMh 9v, last a couple weeks.

Don’t think the discharge character of NiZn will work all that well with the application unless you don’t mind pulling and charging them on a routine basis.

Haha!
Turns odd it was indeed odd. The smoke detector had malfunctioned (KIDDIE smoke & CO2 detector)

It beeps every 30 seconds no matter what brand new batteries are installed. Time to get a new SD. (Not Kiddie)

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA
Tinderbox UK wrote:

 I wonder if those Batteriser/Batteroo AA adapter sleeves would work they put out a constant 1.5v at low current, HKJ did a review of them a week or two ago and said they might  be of use in certain circumstances.


 


John.

I think using Batteroos with NiZn would not work….well maybe once. The reason being is that they work by boosting the voltage at the expense of current.
They will pull the NiZns (or any battery’s) internal voltage down so far that it will damage the NiZns permanently.
Doesn’t matter what voltage is showing outside the battery, what destroys the battery is the batteries actual voltage.

Zebretta
Offline
Last seen: 1 month 1 week ago
Joined: 12/08/2016 - 18:57
Posts: 494
Location: USA

Someone needs to come up with an inexpensive (under $5.00) adjustable low voltage (1.00v – 5v) cut off board similar to the LN2596 Buck converter boards.

hank
hank's picture
Offline
Last seen: 2 days 16 hours ago
Joined: 09/04/2011 - 21:52
Posts: 7334
Location: California

> cut off board

Amen. These are fragile flowers needing protection of some sort.

I had eight PowerGenix AA cells to start. Half of them have failed over several years (fast blink on the charger says it’s got a problem cell in it).

None of the remaining four cells will hold much capacity for more than a day or two, after charging they’ve fallen to 1.16v, .98v, .96v, and .92v.

Pages