sandwich packs?

[electrobent]

I was at harbor freight yesterday at they have NiMH D Cells that purport to be 15000 mAh in packs of 2 for $7.

They have no tabs though . . .

I am thinking that perhaps they could be sandwiched between layers of plastic with soft copper glued to them. The plastic pieces coulf be held together with nuts and bolts. If this worked it would obviate the need for tabs.

Anybody ever try any thing like this?

 

[TylerDurden]

I was at harbor freight yesterday at they have NiMH D Cells that purport to be 15000 mAh in packs of 2 for $7.

Might be 1500mAh?

 

[electrobent]

they come that small?

My AA's are all above that.

In any case, tabless cells are cheaper and easier to find.

 

[TylerDurden]

they come that small?

My AA's are all above that.

In any case, tabless cells are cheaper and easier to find.

The largest NiMh AA i have is 2500mAh.

The largest D NiCd I have is 4000mAh.

You might find a 15000mah Ni cell, but I don't think @ HF.

As for building packs, check gary's site: http://www.tppacks.com

 

[vanilla ice]

Somebody buy a pair and load test them, see what they are really made of.

 

[dogman dan]

Some of the really cheap nimh and nicads, like at harbor freight, may be AA sise in a C or D sise case. If the price and the ah is the same for all sizes , that would be the case. I have some for my Ipod boombox, and they don't last long, but fit the battery case in the boombox.

 

[electrobent]

Here is what I ended up with:

 

[liveforphysics]

If they do what they claim, it's $0.19/Whr. If they do half of what they claim, it's still $0.38/whr. That's cheap enough to at least be worth looking into for applications where weight and space aren't factors as much as low cost bulk energy storage.

 

[morph999]

 

[BLUESTREAK]

I agree with DOGMAN I bought a bunch of those from HARBOR FREIGHT and thay don't have a third of the capacity that thay claim. just like a electric steel plate shear i bought from them that thay claim will shear 14ga. mild steel plate, I broke three on the first try and thay finally gave me a full refund but still sell the same shear with the same claims.

 

[electrobent]

Sorry, I did NOT end up with the Harbor Freight cells

 

[Velocipede]

I thought D cells could have a great advertised capacity, but were meant to be used at very low discharge rate and that if you put one under 1C you were in for much disappointment.