if i understand it correctly, orion 900's are now peak 900's? i've had good luck with orion 900's so i bought a case of peak 900's to replace the orion cells i've been using for over a year now.
i've put 3 sets through the break in process and not one cell has topped 750 mah, 1.43v. is this common to get such low mah rating on a 900 mah cell?
if i understand it correctly, orion 900's are now peak 900's? i've had good luck with orion 900's so i bought a case of peak 900's to replace the orion cells i've been using for over a year now.
i've put 3 sets through the break in process and not one cell has topped 750 mah, 1.43v. is this common to get such low mah rating on a 900 mah cell?
I picked the 12 best cells from 4 packs and my capacity ranges from a low of 766 to a high of 940 mAh, with voltages between 1.46 and 1.51v. Not too uniform I'd say
I picked the 12 best cells from 4 packs and my capacity ranges from a low of 766 to a high of 940 mAh, with voltages between 1.46 and 1.51v. Not too uniform I'd say
Unfortunately to get a truly "matched" pack, you must go through quite a high volume of cells. Also, side note, if you are trying to match your packs, voltage is the least important number to consider
__________________
Mike Gee
Reflex/Team Associated/Reedy/LRP/Castle Creations/Psycho Cells/Exotek/5nines/EMU Racing
Unfortunately to get a truly "matched" pack, you must go through quite a high volume of cells. Also, side note, if you are trying to match your packs, voltage is the least important number to consider
I was scratching my head there too. High voltage is nice but I usually go by capacity and or internal resitance. If I had the equipment, average voltage for the first 10 minutes (my longest race), under a race discharge load.
These 1.4x and 1.5x numbers you are getting. Is this your peak voltage at the end of a charge?
I was scratching my head there too. High voltage is nice but I usually go by capacity and or internal resitance. If I had the equipment, average voltage for the first 10 minutes (my longest race), under a race discharge load.
These 1.4x and 1.5x numbers you are getting. Is this your peak voltage at the end of a charge?
Voltage is a function of runtime. So if you have 2 cells, lets say with the same IR, and one has 100 sec more runtime but a slightly lower voltage, that cell will blow away the other cell on the track because it can hold its voltage much longer (also its avg IR is better as well b/c of the longer runtime). The only time voltage is relevant is if 2 cells have the same runtime and IR, but at that point id doubt if they were off by more than a few hundreths of a volt
__________________
Mike Gee
Reflex/Team Associated/Reedy/LRP/Castle Creations/Psycho Cells/Exotek/5nines/EMU Racing
voltage figures were not provided for relevance to matching, just for illustrating the variation within the cells.
Thanks Arch. Couldn't have said it better.
Quote:
Originally Posted by arch2b
i'm just surprised that these 900's are providing such low true capacity numbers. the orions i have are much more consistent and higher capacity.
I was too. I use these cells in mod and have been quite pleased with them lately, in spite of the poor capacity numbers. I used them last night to run race 2 of our Reflex series, and they gave me the power I needed for the entire 15 minutes (and the win). When charged at a low rate (200mA), the capacity is considerably more than the 900mA rating. The capacity numbers I sited earlier were at a charge rate of 700mA.
Try a slow charge and see if your numbers improve.
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