Where to dispose of NiMH cells

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Kevin_PA
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Where to dispose of NiMH cells

I did a Leaf cell conversion last year and I have the old NiMH pack to dispose of.
Any ideas on where to dispose of it? It's too much for the normal battery recycling stations at retailers like Lowe's, etc.
But not enough to do a bulk ship to a recycler. (At least not without a huge charge for the shipping package.)
I'm in SE PA.

Kevin_in_VA
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Re: Where to dispose of NiMH cells

Have you tried posting them for free on Craigslist or Facebook Marketplace? Might be some tinkerers that want to use them for a project. Though I suppose that also depends on how many cells are still usable. I still have my NiMH pack after replacing with Leaf modules. Contemplated electrifying a riding lawn mower with them, but that project is mostly shelved for now...

______________________________________________
2007 Vectrix VX-1 (19 gen2 Leaf modules, ESD charger)
2013 Nissan Leaf SV

israndy
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Re: Where to dispose of NiMH cells

I don't wanna break up this Kevinsation, but I think Kevin in VA is right, Kevin in PA should see if someone wants them. I am doing a conversion to Leaf cells and I will take the good NiMH cells I get from the bikes and build a big battery to power my TV from after the sun goes down that charges from solar each day.

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I also own a 2018 Tesla Model 3 and a 2012 Mitsubishi iMiev

Kevin_in_VA
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Re: Where to dispose of NiMH cells

Haha, indeed!

I'll be curious to see what you do/use for your solar build. And for what it's worth, I took lots of pictures when I converted to 19 Leaf modules, but never got around to formally documenting my build...

______________________________________________
2007 Vectrix VX-1 (19 gen2 Leaf modules, ESD charger)
2013 Nissan Leaf SV

israndy
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Re: Where to dispose of NiMH cells

Would love to see those photos if you wanna upload them to google or something public (I use Imgur for most of my stuff).

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I also own a 2018 Tesla Model 3 and a 2012 Mitsubishi iMiev

Kevin_PA
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Re: Where to dispose of NiMH cells

That's a good idea. I have already done some amount of checking of individual cells since I was considering building a couple of 12V packs for use with a trolling motor. I don't mind throwing out a few bad cells, but I replaced the NiMH pack once, so I have two full packs to dispose of.

BTW, from my conversion, I started with 19 Leaf modules and one died. (Half of one actually - there are two cells per module.) I reconfigured with just 18 and have been running that since. I prefer the 18 module configuration. The motor controller has a limiter function that greatly reduces the dynamic braking current if the pack voltage is above 140V. With 19 modules, the regen function is minimal and basically unusable. With 18 modules, at least for the lower half of the pack's discharge is below 140V so regen works properly. Not aware if any newer motor controller firmware addresses this issue. I used the most current firmware at the point that I did the conversion.

2007 VX-1

israndy
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Re: Where to dispose of NiMH cells

Good info, thx. I did buy 19 cells and I tested them all so I will probably do like you and start with 19 and wait for a cell to go and then bypass it. My luck I'll lose two.

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Kevin_in_VA
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Re: Where to dispose of NiMH cells

@Kevin_PA: Regarding the minimal regenerative braking with 19 modules, were you using the Dugas Engineering firmware or Team Laird's firmware? Antiscab told me in the past that the Dugas firmware has less regen braking than Laird's. I've been running Laird's since my conversion in October 2019, but I'm not a huge fan of the KPH speedometer reading. Dugas will allow me to switch to MPH.

______________________________________________
2007 Vectrix VX-1 (19 gen2 Leaf modules, ESD charger)
2013 Nissan Leaf SV

R
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Re: Where to dispose of NiMH cells

Here in Barcelona we usually ship these NIMH bateries to recycler, occasionally we offer them any owner still stuck with NIMH, who may need replacements. Members of vectrix group tried to use NIMH for solar storage, but this chemistry is kind of nighmare... self discharge, overheat, memory effect....

israndy
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Re: Where to dispose of NiMH cells

I am in the process of finally attempting to build my 12v battery of NiMH cells as it seems my pack was in great shape other than a single cell, and wiring for 12v gives me a few extra cells. Not sure what part is nightmarish, I would think it would be better for this purpose than Lead Acid which you cannot deep discharge or Lithium Ion which are still expensive and you don't wanna charge above 80% unless you are going to use it immediately.

Not that I know how best to charge the giant batt, but I am gonna just use 45 and 55 amp RV battery chargers and see how I do. I will only be turning the chargers on when there is excess solar. Not sure how I will automate that, but I hope to figure it out in the not too distant future

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I also own a 2018 Tesla Model 3 and a 2012 Mitsubishi iMiev

Kevin_in_VA
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Re: Where to dispose of NiMH cells

@Kevin_PA Heh, I too was thinking about creating a 12v trolling motor battery pack. Just need to get a boat and motor first! I've probably scrapped the idea of using my NiMH cells to build an electric riding mower.

@israndy I see you started a new thread with your 12v battery build, which is very helpful! https://visforvoltage.org/forum/14548-building-giant-nimh-12v-battery-old-vectrix-batts

______________________________________________
2007 Vectrix VX-1 (19 gen2 Leaf modules, ESD charger)
2013 Nissan Leaf SV

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