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Old 02-18-2004, 02:04 PM   #3721
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Originally posted by JohnMatrix
Hey Guys,

Quick question. How soon before you race should your batteries be charged?

Should be charged as close to race time as possible? Or an hour before? or what?

thanks.
you should bring at least something charged for early practice and you will have enough time to charge be fore racing starts....I say get there early and set-up and get charging .. id atleast have your race packs up about 1/2 hour before you run..or as close to your heat as possible....
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Old 02-18-2004, 02:09 PM   #3722
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Initial peak within 5 minutes of your race is ideal.

Last race I peaked with 10 minutes left. I covered them up with a towel to keep them from cooling. It seemed to have the same results as peaking within 5 minutes of the race. I also try and discharge down to 5.4 or 3.6 as soon as I can after my race and let them air cool.
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Old 02-18-2004, 02:17 PM   #3723
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If they peak too long before your race yout can repeak just before the race. If it's been long enough that they've cooled, just repeak with the same settings on your charger. If the cells are still warm, you will want to lower you peak detect and re peak the cells. As long as they're good and warm when you hit the track, you'll be fine.
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Old 02-18-2004, 02:31 PM   #3724
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john are you sure you want to leave to go to Cali as it is going to be in the 40's the next few days.
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Old 02-18-2004, 02:35 PM   #3725
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I dont know... California and racing and fun in the sun for a week on the beach or PA - wedding planning and work. LOL You decide Did you decide if you're going to make the last ORL race? DC trax moved (is currently moving) their track to a different part of the building so I don't know what its like now.
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Old 02-18-2004, 02:47 PM   #3726
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Hey John to bes of my knowledge me and Chris will be going as long as I have my radio here (should be here any day now). I tihnk Chris will be sporting a TC3 or possible his new Barracuda R3 at this race.

I tihnk wedding planning and racing in California are better than racing in PA right now and 100% better than work.
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Old 02-18-2004, 03:13 PM   #3727
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Ok kool thanks for the info.

And than after the race I discharge all batteries down to .9. Do I wait to do this after the batteries cool? Or does it matter?

Also I heard never charge batteries when there warm is that true?
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Old 02-18-2004, 03:43 PM   #3728
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You want to discharge them right away. Usually after you trun marshal is fine. But don't force cool them on a fan. Let them air cool. Never charge your packs when they're still warm from a discharge. You need to let them cool for at least an hour or so before you charge again.
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Old 02-18-2004, 03:45 PM   #3729
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thanks Jon,


you rock!
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Old 02-18-2004, 03:47 PM   #3730
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No Problem. That's what I'm here for.
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Old 02-18-2004, 04:21 PM   #3731
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Xcuse me, but "Don't force cool them"?????

I always tought that heat is bad for packs, so i always cool them down with a fan. I never charge them 2 times a day tough.

Regards
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Old 02-18-2004, 04:25 PM   #3732
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Quote:
Originally posted by Hardriven RC
Xcuse me, but "Don't force cool them"?????

I always tought that heat is bad for packs, so i always cool them down with a fan. I never charge them 2 times a day tough.

Regards
While it's true that heat isn't the best thing for your packs, force cooling them is even worse. When you fan cool a pack the outside of the cell cools down quickly while the core of the cell is still hot. I would think this is far worse for the batteries than just letting them cool down on their own.

-James
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Old 02-18-2004, 04:28 PM   #3733
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Everything I've been told, cooling them on a fan causes the chemicals inside the cells to become unstable and can hurt the life of the cell. You also never want to have them on a fan while charging them. You want the cells to get good and warm. You don't want them burning hot but good and warm. Mine usually get around 130F.
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Old 02-18-2004, 05:56 PM   #3734
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Default so much rip!

i just gotta say the the fukuyama 1.169's got some rip! just got these gp's a week ago and decided to test them out today. couldn't believe the punch these cells have...by the way, these are the shorty cells.

charged them at 5 amps, 50mv peak detec, with a 4500 limit on the yoke bcsd charger.

i run a tc3 with an orion core stock on some reedy 769's. can't wait for the season to start up here in the bay area.

gotta get some mo!
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Old 02-18-2004, 06:10 PM   #3735
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The reason that cooling cells with fans is damaging to them is that you are dealing with a cell with several different materials. Metals plastics and chemicals. And you cannot consistantly cool them all evenly with an outside cooling source. Letting them cool by themselves keeps the cooling consistant.

Heat is not the enemy but extreme heat is, like any fluid or metal there is a ideal heat temp at wich they will transfer electricity at the best while not too hot that the materials themselves are damaged by the heat. Ideal operating temp is right on Fukuyamas website 135f to 155f. Hot, but not hot enough to damage the cells.
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