Remote Living > Lighting
LED battery substitution
dnix71:
RandomJoe The AA sized LiFePO4 cells I have are exactly the same dimensions as a common AA battery. They are made that size on purpose. Because they have exactly double the nominal voltage as an alkaline AA they can be used with a dummy cell where 2 AA's would be. I bought them for my camera. The pictures I post here were shot on a Canon 120IS using one AA sized LiFePO4 cell and a homemade dummy cell.
RandomJoe:
Okay, good to know. I'll look around a bit more. The ones I got are intended for landscape lighting. I now remember reading about your camera post, that would be handy.
The thicker cell is actually helpful for these little flashlights I have, it's slightly narrower than the original cell holder so rattles around a bit inside but makes contact just fine. A few turns of electrical tape around the center of the cell shimmed it nicely in the center of the flashlight body.
dnix71:
This is an example from eBay. Radio Shack also sells them as solar landscape replacement cells. Note the voltage as 3.2, these are lithium iron phosphate, not the 3.7v organic lithium.
THESE http://www.ebay.com/itm/2-14500-3-2V-600mAh-LiFePO4-AA-Size-Rechargeabe-Battery-1pc-2pcs-1-2-1-5V-Cell-/321045237949?pt=US_Rechargeable_Batteries&hash=item4abfc990bd
or https://www.radioshack.com/product/index.jsp?productId=4230401
NOT these from Radio Shack, they are 4/5's of a AA https://www.radioshack.com/product/index.jsp?productId=12905984
Simen:
Dnix;
Please, do not call the non-FePO4 cells for 'Organic' Lithium; they're mainly Cobalt or Manganese based, and there's nothing organic about them. Let's not start 'mis-naming' Lithium cells; it will only lead to confusion later on. :)
That said; there are some research on using Purpurin instead of Cobalt in Lithium cells; an organic compound derived from a plant called Madder, but this is still experimental... ;)
dnix71:
Simen Okay.
The original separators in high powered Li cells were acetates. If the cell was overcharged or overheated the separator would melt, the electrolyte mix and then hydrogen gas produced in the cell would burn along with the acetate separator. Only the LiFePO4 cells don't produce hydrogen gas so they didn't burn if overcharged.
The inherent safety of LiFePO4 cells is why I prefer them over the others with slightly higher voltages.
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