Expected runtime on SAFT LS 17500 primaries

[angelofwar]

I put 2 of these in my 6Z w/ A19 running an M60F. The both read 3.66 volts. Funny thing is, the light was real dim...does this have to do with the MaH rating? If so, even though the light may not be bright, how long could I expect, say a P60L, to run on these???

Here's the Specs:

Voltage</B>3.6Capacity</B>3400 mAh / 3.40 AhRating</B>12 Whr
Voltage</B>3.6Capacity</B>3400 mAh / 3.40 AhRating</B>12 Whr3.6V/3400 mAh/3.4 aH

Thanks for any insight...I not a battery junky by trade...LOL!

 

[45/70]

I'm guessing your Saft cells are of the Lithium-Thionyl chloride chemistry. These type cells are only good for very low drain devices. I'm not sure about a 17500, but the 14500's are only good for about 100mA current drain, at best.

Dave

 

[Mr Happy]

As 45/70 said, those SAFT cells are not intended for use in lights. They are designed for ultra-low drain devices. If you try and put any kind of load on them they will perform terribly.

 

[angelofwar]

Thanks all...so, would they even work semi-decent on a 5mm LED??? or would the 7.2 volts insta fry it?

 

[shark_za]

I have been investigating a SAFT lithium 14500 primary that is capable of 1A drains.
I will report back once I have them in hand.

 

[45/70]

Thanks all...so, would they even work semi-decent on a 5mm LED??? or would the 7.2 volts insta fry it?

Unless the light uses a buck circuit (as in, an LED light), two cells @ 7.2 Volts would definitely fry a 5mm LED.

I have used single Saft LS 14500 cells in a Peak Kilimanjaro (7 LED). It pushes over the limit of the cell's capability a bit, but it's OK. A LiCo 14500 really works better though.

The Saft cell's usable capacity is greatly reduced when high current is involved. A five, 5mm LED, or less, light would most likely work quite well. The best use would probably be a single direct drive 5mm LED light. It would probably appear to run forever. :)

I have been investigating a SAFT lithium 14500 primary that is capable of 1A drains.
I will report back once I have them in hand.

That would work! I question the cost vs. using LiCo cells though. I would think LiCo cells would be more practical. Also, I imagine the capacity of these cells would be somewhat less, as compared to the lower current models. Keep us posted! :thumbsup:

Dave

 

[Kestrel]

As 45/70 said, those SAFT cells are not intended for use in lights. They are designed for ultra-low drain devices. If you try and put any kind of load on them they will perform terribly.

So my question regarding these cells is this, they will perform terribly in which of two ways:

1. As the maximum current the cell might deliver will be on the order of ~100 mA or so, our emitter output will be very low
2. or since we are 'stressing' the cell by asking for the maximum current that the cell chemistry can deliver, the total watt-hours will be much lower than expected (in addition to the low outputs from #1).

So which type of terrible, low output (but resulting in very long runtimes) or greatly decreased watt-hours from the cell (resulting in much shorter runtimes than would be expected from the posted capacities).

(For our uses, situation #2 is far worse than situation #1).