Nickel Iron batteries

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JonCombat

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Jan 11, 2022
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Has anyone built their own or purchased used Nickel Iron batteries? They require maintenance and the power density is low but they can last a life time!
 

Oberfail

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Jun 22, 2021
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169
i have a couple ones laying around from old laptop batteries
at some point, i do wanna mess with them, but not right now

why do you think, that they can last a lifetime? their memory effect is pretty severe and they dry out over time

//edit
nvm, i thought you meant nickel hydrate batteries

From what i'm reading, they behave like lead acid batteries, except they dont sulfate or similar when discharged, so they dont loose capacity due to being discharged to any point. But they need to be refilled with water every couple of weeks, loose charge over time and are similiar inefficient like lead acid while being charged. Defenitly a neat old technology and they can be usefull for certain scenarios, but i find lithium batteries leagues better for a powerwall.
 
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Korishan

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Jan 7, 2017
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6,640
they can last a life time!
This is subjective. What is considered a "life time"? 1yr, 5yr, 10yr, 20yr ?????

And to be honest, "everything" lasts a life time.
 

OffGridInTheCity

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Dec 15, 2018
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1,869
This is subjective. What is considered a "life time"? 1yr, 5yr, 10yr, 20yr ?????

And to be honest, "everything" lasts a life time.
I bought a 'lifetime warranty' on a Lazy Boy recliner. It broke after 10yrs but wasn't covered as Oregon law has defined 'lifetime' warranties expire after 7yrs.

So maybe 7yrs? ;)
 

JonCombat

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Joined
Jan 11, 2022
Messages
13

JonCombat

New member
Joined
Jan 11, 2022
Messages
13
i have a couple ones laying around from old laptop batteries
at some point, i do wanna mess with them, but not right now

why do you think, that they can last a lifetime? their memory effect is pretty severe and they dry out over time

//edit
nvm, i thought you meant nickel hydrate batteries

From what i'm reading, they behave like lead acid batteries, except they dont sulfate or similar when discharged, so they dont loose capacity due to being discharged to any point. But they need to be refilled with water every couple of weeks, loose charge over time and are similiar inefficient like lead acid while being charged. Defenitly a neat old technology and they can be usefull for certain scenarios, but i find lithium batteries leagues better for a powerwall.
maintenance is not an issue, replacing lithium-ion batteries every 5-10 yrs can be expensive. If used for a fixed solar system and space/weight is not an issue I think they would be ideal. Since the power density is not their for in-rush loads I wonder if you can create a hybrid battery setup and add some lithium batteries to help supply the in-rush current when a compressor/AC is turned on.
 

Oberfail

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Joined
Jun 22, 2021
Messages
169
Feel free to build a system based on them and report back on how it performs. It would defenitly be an interesting topic at least and its the first time, that i heard of those batteries.
 

JonCombat

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Jan 11, 2022
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13
The cost of nickel iron batteries is insane. I guess there is not much profit to be made if you make a battery that lasts decades! They have been around for 100+ yrs
 

Oberfail

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Joined
Jun 22, 2021
Messages
169
They contain a lot of material and aren't a very demanded product, so yeah, the price isnt cheap. Maybe you can find some second hand ones.
 

floydR

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Joined
Aug 23, 2017
Messages
1,360
Lithium Tinanate datasheet https://files.gwl.eu/inc/_doc/attach/StoItem/6991/LTO-40AH-CY_datasheet.pdf so LT) has many of the same properties as NiFe batteries. long life being the key one 30,000 cylce life time works out to be 82 years<edit>@1 cycle per day. < first datasheet I found.
Maybe you can find some second hand ones.
I saw some 4 or 5 years ago on Ebay. Used not just one cell. like is on ebay now. The new ones on ebay work out to $659 a kWh of storage.
 
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