Battery cycling question
02-03-2005, 10:16 AM
#16
Thanks Picco,
That is what I was getting at. Two good packs at the same age, they are obviously both good packs. It could be possible that one of the packs isn't soldered as well as the other, that could cause a difference but generally we are talking about difference of 1 or maybe 2%. There are not many guys who can tell.
Chris.
That is what I was getting at. Two good packs at the same age, they are obviously both good packs. It could be possible that one of the packs isn't soldered as well as the other, that could cause a difference but generally we are talking about difference of 1 or maybe 2%. There are not many guys who can tell.
Chris.
02-03-2005, 12:44 PM
#17
Also consider, that for each of those cycles, you take out one good run, which could have been a race-cycle instead... well, your budget might be better than mine anyway 
I believe you cant compare these date too detailed. I mean, I have 4 packs of matched GP's from a weelknown matcher, they are bought the same day, they have the same amount of runs and cycles and they are treated the same way. But when I charge all 4 the same, day, they peak at different temperatures....
Next time I do this, the same happens... But it's not the same pack which have the lowest temp each time... The differences is 5-10 degrees celsius... 
So as far as I can see, the very same pack, might perform slightly different each time.
I believe you cant compare these date too detailed. I mean, I have 4 packs of matched GP's from a weelknown matcher, they are bought the same day, they have the same amount of runs and cycles and they are treated the same way. But when I charge all 4 the same, day, they peak at different temperatures....
Next time I do this, the same happens... But it's not the same pack which have the lowest temp each time... The differences is 5-10 degrees celsius... So as far as I can see, the very same pack, might perform slightly different each time.
02-03-2005, 03:02 PM
#18
Your right. 
02-03-2005, 06:21 PM
#19
Cole,
Thats a great point, I temperature charge in the winter though so all of mine are the same 110F.
Chris.
Thats a great point, I temperature charge in the winter though so all of mine are the same 110F.
Chris.
02-04-2005, 08:56 AM
#20
Tech Apprentice
Interesting discussion, but I'm curious if you most of you only rate your packs by discharge voltage. It sounds like alot of you have Turbo 35's and I'm wondering how many of you hook it up to a computer and actually print out the discharge curve?
I've found that even two packs from the same matcher with the same discharge voltage can have different discharge curves. When rating packs I find this to be a great help and often the deciding factor not voltage.
I've found that even two packs from the same matcher with the same discharge voltage can have different discharge curves. When rating packs I find this to be a great help and often the deciding factor not voltage.
02-04-2005, 09:03 AM
#21
What do you have to do/have to do the discharge curve?
Originally posted by M LANE
Interesting discussion, but I'm curious if you most of you only rate your packs by discharge voltage. It sounds like alot of you have Turbo 35's and I'm wondering how many of you hook it up to a computer and actually print out the discharge curve?
I've found that even two packs from the same matcher with the same discharge voltage can have different discharge curves. When rating packs I find this to be a great help and often the deciding factor not voltage.
Interesting discussion, but I'm curious if you most of you only rate your packs by discharge voltage. It sounds like alot of you have Turbo 35's and I'm wondering how many of you hook it up to a computer and actually print out the discharge curve?
I've found that even two packs from the same matcher with the same discharge voltage can have different discharge curves. When rating packs I find this to be a great help and often the deciding factor not voltage.
See you in a couple of weeks harsh
02-04-2005, 09:36 AM
#27
Mlane,
Read my CDAT website.
I find voltage secondary to run time, particularly as I run mod 12th. However, even if I ran stock I'd be more interested at the voltage at 5 minutes than the total average voltage. Recently I have been looking closely at the data from the last minute of discharge to look at eh slope of the curve and how much voltage cell has during the last 30 seconds of discharge.
Chris.
Read my CDAT website.
I find voltage secondary to run time, particularly as I run mod 12th. However, even if I ran stock I'd be more interested at the voltage at 5 minutes than the total average voltage. Recently I have been looking closely at the data from the last minute of discharge to look at eh slope of the curve and how much voltage cell has during the last 30 seconds of discharge.
Chris.
You might blow something up
02-04-2005, 11:50 AM
#30
Harshguy: First of all to properly train your packs and see which ones are better you should use 30 amps or even 35 amps. With todays motors 20 amps is outdated.
The higher load will weed out the packs better. Your pack with higher AIR will drop more more voltage from 20 to 35 amps then the pack with lower AIR.
The higher load will weed out the packs better. Your pack with higher AIR will drop more more voltage from 20 to 35 amps then the pack with lower AIR.