AA to Li-ion

mpainter · Dec 1, 2015

I have a 2D mag that uses two battery holders, both 3AA to D size in series.
I rarely use it anymore and would like to switch to two D cell lithium batteries.
At this point I don't see any need for rechargeable.
Any reason why it can't be done?
Any brands to avoid?

xzel87 · Dec 2, 2015

Perhaps I'm not well versed in the topic but is there even a D sized Lithium Primary cell?, I know there are AA sized, AAA sized and 9V sized but I have never heard of a D sized Lithium Primary cell.

Perhaps an LED drop in upgrade from Malkoff Devices or other brand and 2x26650 Li-Ion Cell with battery sleeve?...but that's another whole can of colourful exciting worms

mpainter · Dec 3, 2015

D cell sizes exist but rechargeable ones don't seem to. Thanks for the idea but this is a custom light and I don't have the option to drop something in.

ChrisGarrett · Dec 3, 2015

mpainter said:
I have a 2D mag that uses two battery holders, both 3AA to D size in series.
I rarely use it anymore and would like to switch to two D cell lithium batteries.
At this point I don't see any need for rechargeable.
Any reason why it can't be done?
Any brands to avoid?

Your holders are each probably wired in parallel, for capacity and then they're both placed in series to equal the voltage of two D alkalines in series--3v.

If each holder was wired in series, you'd have 4.5v+4.5v for a total of 9v, which is probably not the case with a stock 3v light.

There are 32650 lithium-ion rechargeable batteries, but they're off the charger voltage will be ~4.2v, so 8.4v in series. You can get plenty of mods. I don't think that there are any D size Energizer Lithium Advanced, or Ultimates for use to buy.

Chris

mpainter · Dec 3, 2015

The holders are in series, not parallel.

mpainter · Dec 3, 2015

8.4 vs 7.4 might be worth the gamble.

xzel87 · Dec 3, 2015

mpainter said:
...but this is a custom light....

Any pics?

fivemega · Dec 3, 2015

mpainter said:
D cell sizes exist.

Are you sure they are capable of current draw you looking for?
Most of lithium primary D cells are for super low current.

mpainter · Dec 4, 2015

I didn't think of that, thanks. I will look into it.
I also vaguely remember that two 18650's will fit with a bit of mod to the spring. I'll look it up.

mpainter · Dec 4, 2015

https://photos.google.com/album/AF1QipPVA6OalTJv5Gfazz3Xd1-jDM0bgu-avbYk0oJD

The high trek knob on the pot is a sink washer. A bit more than half a turn from full on to "dim". It's about as bright as a 3 cell incan mag light but with much more spill.
I would show it to people (other volunteer fire fighters) in this setting and get a polite "that's nice "
Flick it to high and their lights are useless.
The reflective tape is there for two reasons. I wanted to be seen by traffic and finding it again in a dark grassy field is a bit easier.

mpainter · Dec 4, 2015

http://www.kaidomain.com/product/details.S004141

has what I'm looking for.

fivemega · Dec 4, 2015

mpainter said:
At this point I don't see any need for rechargeable.

mpainter said:
http://www.kaidomain.com/product/details.S004141
has what I'm looking for.

Those are rechargeable and not primary.
However, if rechargeable is your goal, Panasonic 18650 (3400mAh) will work much better with true 3500mAh and not fake 5000mAh
To use 18650 cells, some spacer (PVC tubes) needed.

mpainter · Dec 4, 2015

Where does the information that 5000 is fake come from?
The value is in line with the ratio of a 10650 (2200). to an 18650 (3500)

fivemega · Dec 5, 2015

mpainter said:
Where does the information that 5000 is fake come from?

Brand, source and experience.

mpainter said:
The value is in line with the ratio of a 10650 (2200). to an 18650 (3500)

Volume is not the only factor for capacity.

mpainter · Dec 5, 2015

I gave the capacity, volume ratio would be much higher.
In any event you claim the ratings are fake. Where is the evidence?

fivemega · Dec 5, 2015

mpainter said:
I gave the capacity, volume ratio would be much higher.

Again, volume is not the only factor for capacity.
However I would like to see your comment after you receive and test them for a while.

mpainter said:
In any event you claim the ratings are fake. Where is the evidence?

Evidence 1

Evidence 2

swampgator · Dec 6, 2015

fivemega said:
Brand, source and experience.

Volume is not the only factor for capacity.

FM's experience is vast. I'd take his word for it.

AA to Li-ion

mpainter

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xzel87

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mpainter

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ChrisGarrett

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mpainter

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mpainter

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xzel87

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fivemega

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mpainter

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mpainter

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mpainter

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fivemega

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mpainter

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fivemega

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mpainter

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fivemega

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swampgator

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