P7 M@g battery question.

[rizky_p]

Does anyone have a runtime graph of P7 running on 3xD/C or 1xD Lithium?
Which one push the P7 at maximum with longer time?

EDIT: D/C cells: here refers to Ni-Mh not Primary.

Thanks.

 

[Scourie]

I think "D" alkalines struggle to output 3 amp, and if they can manage it the capacity of the battery is drastically reduced. Have a look here;

http://www.duracell.com/oem/primary/alkaline/alkcapacity.asp

At 3A current the battery only takes an hour to drop to 0.8v!

D lithium would seem the way to go.

Rob

 

[270winchester]

where does one get a D Li-Ion?

 

[Dead_Nuts]

You can buy Saft D-cell Li-SOCl2 primary batteries rated at 3.6v and 13.0Ah. Of course they are almost $25 each. Not sure what they are used for.

 

[JimmyM]

Double check their continuous output current. That 13 Ah is at something like 100mA I bet.

 

[StefanFS]

I don't have graphs yet, but:

• 3 x D size NiMH gives me over two hours at 3A to the SSC P7. They hold up well. I use noname but high quality 9000 mAh NiMH, such (quality) cells seem to have lower self discharge when they are under 10 000 mAh.
• 1 x D size LiION unprotected 5000 mAh provide ~2.5 hours at 2.4A, ~2hours at 2.8A and ~1.45 hours at 3A.

All runtimes are flat with the AMC7135 based drivers I use with my CSXPI and CSWOI SSC P7 Mags. I bin = vf is 3.25V-3.5V.

 

[rizky_p]

I don't have graphs yet, but:

• 3 x D size NiMH gives me over two hours at 3A to the SSC P7. They hold up well. I use noname but high quality 9000 mAh NiMH, such (quality) cells seem to have lower self discharge when they are under 10 000 mAh.
• 1 x D size LiION unprotected 5000 mAh provide ~2.5 hours at 2.4A, ~2hours at 2.8A and ~1.45 hours at 3A.

All runtimes are flat with the AMC7135 based drivers I use with my CSXPI and CSWOI SSC P7 Mags. I bin = vf is 3.25V-3.5V.

You P7 is I binned, it is easier to mantain regulation but
my P7 is CSWOJ, do you think 3xD/C NiMH able to maintain the same level of regulation?

I am asking because, my current P7 M@g(8x7135+5mode) setup needs 5 Sanyo 2700 inside KD serial adapter to reach 2.8A. It must be the resistance in the adapter that push the amps lower, so i considering a lower resistance alternative(without adapter). I havent decided which way to go, 3xD/C or 1xD Lithium.

Thanks