Rechargeable D Cells In 2024

[xxo]

So 7.2V instead of designed 6V. What about brightness and LED life ?

as best as I can tell, it doesn't run noticeably brighter or hotter on Li-ions, so the regulation seems good and I am guessing that LED life should be good as well.

 

[lumen aeternum]

I recall reading about 1.5V li-ion a couple years ago, but there was no user experience & they were very expensive. Have they made it to "mainstream" yet? 200 mah is decent capacity & claims to have a flat output curve.

> I saw AA and AAA cells, 1.5 v XTAR AA Lithium 3300mWh/2000mAh Battery

At what voltage do you charge them?

 

[kilogulf59]

@lumen aeternum I have no idea. My Xtar DC8 charges 'em for me.

 

[alpg88]

Huh? There are Li ion batteries that have a built in voltage converter to output 1.5V? Is this in a C or D size package?

YEa, they come from many different brands in AAA, AA, D sizes.

 

[snakebite]

Don't know if kilo's radio would handle the extra Voltage, but a 4D Mag ML300 will run on 2X Li-ion cells.

That's because it's a buck driver. 3 cell and up. 2 cell is a boost driver

 

[xxo]

Don't know if kilo's radio would handle the extra Voltage, but a 4D Mag ML300 will run on 2X Li-ion cells.

That's because it's a buck driver. 3 cell and up. 2 cell is a boost driver

Yup .

3 cell ML300 driver:

2 cell:

Photo credit - Old Lumens (RIP)

 

[lumen aeternum]

YEa, they come from many different brands in AAA, AA, D sizes.

The XTAR don't have D. What lithium brand has C, D cells?

 

[lumen aeternum]

Don't know if kilo's radio would handle the extra Voltage, but a 4D Mag ML300 will run on 2X Li-ion cells.

That's because it's a buck driver. 3 cell and up. 2 cell is a boost driver

What about a Mag 4D incan which has a drop-in LED module?
Have to figure out purchase cost choosing between:

2 li-ion with an adapter tube (where to buy ?). Cold weather performance?

4 Nimh in Eneloop D to A adapters, which I already have but would buy more for other 3D and 4D lights. And for the cars, I could keep a package of primary Lithium AA if its super cold outside.

4 Tenergy Nimh D cells, about $22 for four but need to buy a charger that handles D cells The Tenergy charger is about $33.

 

[NiOOH]

What about a Mag 4D incan which has a drop-in LED module?
Have to figure out purchase cost choosing between:

4 Nimh in Eneloop D to A adapters, which I already have but would buy more for other 3D and 4D lights. And for the cars, I could keep a package of primary Lithium AA if its super cold outside.

Eneloop AA to D adapters are single cell only. If you plan to use the light for extended periods, this is not a good solution. You'll have only 2 Ah per cell, compared to 7-10 Ah for a real D NiMH cell. 3 AA to D adapters are a better option, but the cost of the cells will be higher, and you'll have to charge a lot of cells.

I personally have decided to phase out anything that operates on D cells and not purchase any new equipment with this size. It's either AA/AAA or standard LiIon (18650/21700).

 

[kilogulf59]

The XTAR don't have D. What lithium brand has C, D cells?

I Googled Li Ion C cells and there's a few.

 

[bluflaam777]

I'd stay away from any li-ion C/D cells as way too many have been AA in disguise. They even go to the point of adding 'sand' to add weight.
I'm not saying good ones don't exist, but why would a manufacturer go there if the market isn't there also? They won't. They're scams.

Even NiMh cells of every size still exist but the C/D size are dropping off in sales. So, thus they aren't making them much...meaning they too will end up being scams once the shelf life/retail store bits are gone.

Either go all in and buy from a reputable manufacturer now or get ripped later. Or go as others have suggested and use adapters with lesser capacity.

I'm going to get a few tenergy D cells while they can be found. I have the chargers and at least 1 unit that can use them. Otherwise, I have AA/AAA NiMh up the wazoo and lithium of the sizes I need.

 

[NiOOH]

I wonder, if anyone decides to make a LiIon D cell with a converter and USB charging, what LiIoN cell size will it be based upon?

 

[dc38]

I'd stay away from any li-ion C/D cells as way too many have been AA in disguise. They even go to the point of adding 'sand' to add weight.
I'm not saying good ones don't exist, but why would a manufacturer go there if the market isn't there also? They won't. They're scams.

Even NiMh cells of every size still exist but the C/D size are dropping off in sales. So, thus they aren't making them much...meaning they too will end up being scams once the shelf life/retail store bits are gone.

Either go all in and buy from a reputable manufacturer now or get ripped later. Or go as others have suggested and use adapters with lesser capacity.

I'm going to get a few tenergy D cells while they can be found. I have the chargers and at least 1 unit that can use them. Otherwise, I have AA/AAA NiMh up the wazoo and lithium of the sizes I need.

Sand is obviously a safety feature for when the faulty ultrafire cells inside fail :X

 

[lumen aeternum]

I Googled Li Ion C cells and there's a few.

But they are 3.6 volt, not 1.5 volt. Dunno what the 3.6v are good for.

 

[lumen aeternum]

I'd stay away from any li-ion C/D cells as way too many have been AA in disguise. They even go to the point of adding 'sand' to add weight.

Now that's an idea. Maybe I can add lead shot or strips (stained glass U channel) to the Eneloop D to AA adapters, to make them weigh the same as a D cell.

 

[kilogulf59]

But they are 3.6 volt, not 1.5 volt. Dunno what the 3.6v are good for.

Google 1.5 V Li Ion C (or D) cells I had left out the "1.5 V".