R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 02-12-2006, 09:35 AM   #1
Tech Adept
 
ebone's Avatar
 
Join Date: May 2005
Location: BOTHELL WA. U.S.A. AND WE BE CRACKALACKIN
Posts: 200
Default The Perfect Discharge?

What is the perfect discharge? I have had so many questions about this. I have made the jump to 3800 packs and have been getting different stories on the best way to discharge. I used to use a reactor 30 and a novak smart tray, now i have switched to a 0-30 tray. I was thinking of a dyna-pulse or a spintec, but is that needed? What is the perfect discharge?
ebone is offline   Reply With Quote
Old 02-12-2006, 09:52 AM   #2
SC
Tech Adept
 
SC's Avatar
 
Join Date: Oct 2005
Location: Hanover PA
Posts: 185
Default

Questions like this will bring you almost as many variations in answers as there are replys.

Seeing how my reply is the first, I'll share my experience with you

This is what I do...

Remove battery from storage box and discharge to 5.40 on a gfx..( similar discharge device will suffice )...then I place the pack in either a tekin battery doctor tray or a novak flatline tray. These trays both equalize the cell's in the packs. Once the light's have gone out, I charge the pack @ 6.0 amps to a .3 peak detect. Once the battery has peaked, I put it in the car and go race. After the race, I remove the battery, and place it in it's storage box without discharging it

I have been doing this for week's now, the end result has been lower peak charge voltage's..( which means lower internal resistance )..with no real loss of runtime.

I would suggest you experiment with a few different method's and see for yourself what the best outcome is.

SC
SC is offline   Reply With Quote
Old 02-12-2006, 09:56 AM   #3
Tech Adept
 
ebone's Avatar
 
Join Date: May 2005
Location: BOTHELL WA. U.S.A. AND WE BE CRACKALACKIN
Posts: 200
Default

i should specify. i use smc ib3800. and true double true i will be getting many diverse responses, but that is the point i guess.
ebone is offline   Reply With Quote
Old 02-12-2006, 09:56 AM   #4
Tech Elite
 
jamescam's Avatar
R/C Tech Charter Subscriber
 
Join Date: Jul 2005
Location: Dallas, TX
Posts: 2,047
Trader Rating: 10 (100%+)
Default

If you ask 5 people on their discharging method you will probably get 5 different answers. Some people swear by high discharge rates (20 to 35AMPS) others say that anything over 10AMPS just kills your cells quicker. I have found that a higher discharge rate helps my packs maintain punch so I like discharging at 30AMPS. The one thing most would agree on is that 3800's shouldn't be taken lower than .9v per cell. The 0-30 gets it's name from discharging at 30AMPS down to 0v per cell which could be a problem for 3800's. With the equipment you mentioned I would do the following:

- Equalize on the Novak Smart Tray to .9v per cell
- Charge
- Race
- Discharge on the Reactor 30 (I believe the cut off is adjustable)
- Store

The Dyna Pulse is great for battery maintenance but it isnt a good every day discharger as it can take more than 5 hours to discharge a pack. I use the Dyna Pulse on my off race weeks to break down my cells internal resistance.

Hope this helps.
jamescam is offline   Reply With Quote
Old 02-12-2006, 10:43 AM   #5
SC
Tech Adept
 
SC's Avatar
 
Join Date: Oct 2005
Location: Hanover PA
Posts: 185
Default

I was going to ask you if you were using IB 3800's....that is the same cell I use.

As I said in my initial post...don't restrict yourself to one method...try several from suggestions of replys here and use your results as a guide to what works.

SC

Edit: I do not discharge @ anything higher than a 30 amp rate.
SC is offline   Reply With Quote
Old 02-12-2006, 12:36 PM   #6
Tech Master
 
XrayFK's Avatar
 
Join Date: Oct 2005
Location: San Diego, CA
Posts: 1,463
Trader Rating: 1 (100%+)
Default

I would highly recommend using the Spintec BatMan on your packs. You don't have to add an extra cycle just to Spintec a pack, just use it after you run, or after you discharge a pack to 5.4v (it will still discharge for 20-30 minutes).
I used to discharge my packs at 30 or 35A to "keep their punch" but now what I do is this (on a race day):
Tray batteries. 0.9v/cell is a good safe cutoff for IBs, however you can go a bit lower if you are careful.
Charge
Run pack in car
Discharge to 5.4v @20A
Discharge pack using Spintec
Store pack. I usually race every week so I keep them like that, but if you are not going to use the pack for over a week, but about 500sec of charge in them.
XrayFK is offline   Reply With Quote
Old 02-12-2006, 06:48 PM   #7
Tech Adept
 
Veteq's Avatar
 
Join Date: Nov 2003
Posts: 105
Default

For IB 3800's I recommend after your run discharge at 30 amps pulse on the CTX-D after that is finished equilize withe Linear 5 amp setting. Then leave them to cool if you need to run your pack again in the same day. For storing i would put about 450 mah into it.
__________________
Team Associated - Reedy Motors - Team Much More
Slapmaster Tools - Apollo Hobbies - Hi Performance Distribution
Overgeared B.O.D - [email protected]
www.AEforums.co.uk
Veteq is offline   Reply With Quote
Old 02-12-2006, 08:48 PM   #8
Tech Adept
 
Join Date: Feb 2006
Location: Auckland, New Zealand
Posts: 114
Default

i know everyone has posted what they do but this is
what i do

The night or day before the race i discharge my packs at 30amp and when
the packs have dumped i equalise them (i use a trinity absolute zero tray)
and then i put them away until i have to charge them at the track.
When i have finished the race i leave them with the remainder charge left
in them until next week. If you discharge your packs after the race and leave
them for a week there is a chance that one or two of the cells could go bad.
Every 1 or 2 race meets i run them through a spintec. This is really good for the cells and internal resistence will be lowered and voltage and runtime will be increased.

And thats all to it!
Just set aside some time the day before your racing and your cells will stay good for a long time.
Simon A is offline   Reply With Quote
Old 02-12-2006, 09:37 PM   #9
Tech Elite
 
Joel Lagace's Avatar
 
Join Date: Feb 2002
Location: Ottawa, Ontario, Canada
Posts: 2,628
Trader Rating: 4 (100%+)
Default

"For storing i would put about 450 mah into it."

Would everyone agree that if your running stock or even 19T that simply storing the pack after its final run of the day be very similar to dumping and adding a short charge to the pack for storage?
__________________
"Without Rules its just Backyard Bashing!"
www.rcottawa.com
Joel Lagace is offline   Reply With Quote
Old 02-12-2006, 11:21 PM   #10
Tech Fanatic
 
SpeedChair's Avatar
 
Join Date: Jan 2003
Location: Mission Viejo, CA
Posts: 800
Trader Rating: 15 (100%+)
Default

So does the Spintec and DynaPulse do the same thing? Which one would everyone recommend?
SpeedChair is offline   Reply With Quote
Old 02-12-2006, 11:40 PM   #11
Tech Master
 
XrayFK's Avatar
 
Join Date: Oct 2005
Location: San Diego, CA
Posts: 1,463
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by SpeedChair
So does the Spintec and DynaPulse do the same thing? Which one would everyone recommend?
There are several small differences between the two, but yes, they both perform the same pulse discharge. I personally would go (and have stayed with) the Spintec because they are the original innovator for the product, and Trinity "borrowed" the design. Spintec also has superb customer support. But if that doesn't matter for you, the Trinity model is cheaper and can do 4 cell packs.
XrayFK is offline   Reply With Quote
Old 02-13-2006, 01:09 AM   #12
Tech Adept
 
Join Date: Feb 2006
Location: Auckland, New Zealand
Posts: 114
Default

The Trinity Dynapulse also discharges faster (i think)
and has a small screen which makes things alot easier.
Simon A is offline   Reply With Quote
Old 02-13-2006, 03:13 AM   #13
SC
Tech Adept
 
SC's Avatar
 
Join Date: Oct 2005
Location: Hanover PA
Posts: 185
Default

Quote:
Originally Posted by Joel Lagace
"For storing i would put about 450 mah into it."

Would everyone agree that if your running stock or even 19T that simply storing the pack after its final run of the day be very similar to dumping and adding a short charge to the pack for storage?
That is why I do not dump my packs after I remove them from my car.....whats the point of discharging it only to put charge back in for storage?

SC
SC is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Are you perfect? Os_powerd_jato Web Links 2 07-08-2007 08:25 AM
FS Integy Discharge Zero discharge tray tiggersz R/C Items: For Sale/Trade 2 07-05-2007 11:28 PM
what Makes a Perfect Day kcrunchone Nitro On-Road 19 03-24-2007 05:59 AM
The perfect touring car dawgmeat Electric On-Road 42 07-13-2005 05:42 PM
20amp Discharge Vs. 30amp Discharge RCNitroDude999 Electric On-Road 2 02-16-2005 02:16 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 06:21 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net