R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 03-08-2007, 02:34 PM   #1
Tech Initiate
 
Join Date: Feb 2007
Location: Harleysville, PA
Posts: 46
Send a message via AIM to Vismund Cygnus
Default Charging cells on Duratrax ICE

Hey guys,

I'm new to electric and was hoping some of you guys could help me out. When I'm charging racing cells (NiMh), what would be the best charge setting on an ICE? Do I discharge then charge? About how long will the batteries take to charge? Also, does anyone out there have a good guide for assembling battery packs? Thanks!
Vismund Cygnus is offline   Reply With Quote
Old 03-08-2007, 03:48 PM   #2
Tech Addict
 
Iceracer's Avatar
 
Join Date: Feb 2006
Location: Canada
Posts: 656
Trader Rating: 1 (100%+)
Default

What batteries? Brand, configuration, mah rating? The well known ones the supplier has advice on how to care for them and charge them. How long it takes to charge depends on the mah rating of the batteries, how discharged they are, and the rate of charge. For instance, a 3800 mah IB3800 might take 41 minutes to charge at 6 amps when its been discharged to 0.9volts per cell.
Iceracer is offline   Reply With Quote
Old 03-08-2007, 03:56 PM   #3
Tech Adept
 
MadMikeB's Avatar
 
Join Date: Feb 2005
Location: Sydney, Australia
Posts: 187
Default

http://www.modelairplanenews.com/rc/...ld_battery.asp

Quote:
Originally Posted by Vismund Cygnus
Hey guys,

I'm new to electric and was hoping some of you guys could help me out. When I'm charging racing cells (NiMh), what would be the best charge setting on an ICE? Do I discharge then charge? About how long will the batteries take to charge? Also, does anyone out there have a good guide for assembling battery packs? Thanks!
MadMikeB is offline   Reply With Quote
Old 03-08-2007, 05:44 PM   #4
Tech Initiate
 
Join Date: Feb 2007
Location: Harleysville, PA
Posts: 46
Send a message via AIM to Vismund Cygnus
Default

Iceracer-Batteries haven't yet been purchased, but I'm probably going to pick up some Team Brood 4200's.

MadMikeB-Thanks for the link!
Vismund Cygnus is offline   Reply With Quote
Old 03-08-2007, 11:44 PM   #5
Tech Addict
 
Join Date: Apr 2005
Location: north-west Indiana
Posts: 747
Trader Rating: 18 (100%+)
Default

When the batteries are new, you want to put about a 10 minute charge in them, then tray them to .9v/cell. After that either charge them a 6 amps with a 0mv peak or 5 amps with a 3mv peak for a couple of charges. I've noticed on new batteries they get hot the first few charges. Once they "settle" charge at 6 amps with 3mv peak. This is assuming ib4200. As far as assembling: DON'T hold the solder iron on the battery for more than absolutely necessary.
trilerian is offline   Reply With Quote
Old 03-09-2007, 05:05 AM   #6
Tech Initiate
 
Join Date: Feb 2007
Location: Harleysville, PA
Posts: 46
Send a message via AIM to Vismund Cygnus
Default

Quote:
Originally Posted by trilerian
When the batteries are new, you want to put about a 10 minute charge in them, then tray them to .9v/cell. After that either charge them a 6 amps with a 0mv peak or 5 amps with a 3mv peak for a couple of charges. I've noticed on new batteries they get hot the first few charges. Once they "settle" charge at 6 amps with 3mv peak. This is assuming ib4200. As far as assembling: DON'T hold the solder iron on the battery for more than absolutely necessary.
Awesome, thanks! Is the Tekin discharger.equalizer tray any good? It's pretty cheap. BTW about how many packs should I have if I want to be racing? Does charging the batteries really take 41 minutes, or is just 41 minutes when you're initially charging them, not charging them just after you've ran them?
Vismund Cygnus is offline   Reply With Quote
Old 03-09-2007, 10:19 AM   #7
Tech Addict
 
gubbs3's Avatar
 
Join Date: Aug 2006
Location: MN
Posts: 619
Trader Rating: 7 (100%+)
Default

Charge time depends completely on capacity. If you just recharge after a race you might only be putting 2000mah back into the pack which will take a very short time compared to a completely discharged pack that I've seen take upwards of 4900mah.

I know several people that use Tekin's Battery Doc. tray. I do believe though that it's cutoff is a little low (.5v) so if you are not going to be using the pack again the same day you MUST put some charge back into it. A .9v cutoff, I've been told, can sit for up to a week (max) without issues. However, I always put at least 500mah in a pack before a weeks storage.
gubbs3 is offline   Reply With Quote
Old 03-09-2007, 01:29 PM   #8
Tech Initiate
 
Join Date: Feb 2007
Location: Harleysville, PA
Posts: 46
Send a message via AIM to Vismund Cygnus
Default

Quote:
Originally Posted by gubbs3
Charge time depends completely on capacity. If you just recharge after a race you might only be putting 2000mah back into the pack which will take a very short time compared to a completely discharged pack that I've seen take upwards of 4900mah.

I know several people that use Tekin's Battery Doc. tray. I do believe though that it's cutoff is a little low (.5v) so if you are not going to be using the pack again the same day you MUST put some charge back into it. A .9v cutoff, I've been told, can sit for up to a week (max) without issues. However, I always put at least 500mah in a pack before a weeks storage.
Cool, thanks. How much do NiMh's self discharge? If I for instance fully charged a pack at home and drove about 30 minutes to the track, would I have to charge the pack again?
Vismund Cygnus is offline   Reply With Quote
Old 03-09-2007, 01:38 PM   #9
Tech Addict
 
fraz's Avatar
 
Join Date: Mar 2002
Location: Santa Cruz, CA
Posts: 653
Send a message via AIM to fraz
Default

I would repeak it when you get to the track if racing. If practicing, it doesn't matter that much.

Another thing on the Ice is "peak delay". By default it is set for 3 minutes and this causes many false peaks. I set mine for the max of 10 minutes and all is great.
fraz is offline   Reply With Quote
Old 03-09-2007, 01:45 PM   #10
Tech Initiate
 
Join Date: Feb 2007
Location: Harleysville, PA
Posts: 46
Send a message via AIM to Vismund Cygnus
Default

Quote:
Originally Posted by fraz
I would repeak it when you get to the track if racing. If practicing, it doesn't matter that much.

Another thing on the Ice is "peak delay". By default it is set for 3 minutes and this causes many false peaks. I set mine for the max of 10 minutes and all is great.
Cool, thanks for the tip. Know any good tips for alternating between packs during a race? On Promatch's site, it says you shouldn't run a pack more than twice a night during a race, but I don't know how I'll be able to charge other packs efficiently. Thanks for everyones help so far, I really appreciate it!
Vismund Cygnus is offline   Reply With Quote
Old 03-10-2007, 08:34 AM   #11
Tech Initiate
 
Join Date: Feb 2007
Location: Harleysville, PA
Posts: 46
Send a message via AIM to Vismund Cygnus
Default

Anyone?
Vismund Cygnus is offline   Reply With Quote
Old 03-10-2007, 08:39 AM   #12
Tech Lord
 
UN4RACING's Avatar
 
Join Date: Oct 2006
Location: MODIFIED!
Posts: 13,140
Trader Rating: 22 (100%+)
Default

Quote:
Originally Posted by trilerian
When the batteries are new, you want to put about a 10 minute charge in them, then tray them to .9v/cell. After that either charge them a 6 amps with a 0mv peak or 5 amps with a 3mv peak for a couple of charges. I've noticed on new batteries they get hot the first few charges. Once they "settle" charge at 6 amps with 3mv peak. This is assuming ib4200. As far as assembling: DON'T hold the solder iron on the battery for more than absolutely necessary.
Thats a great method. You are actually balanceing the cells. Bringing them down to an even discharge, a perfect way to start a pack. I like that idea its the first time I've heard it.
UN4RACING is offline   Reply With Quote
Old 03-10-2007, 08:55 PM   #13
Tech Addict
 
Join Date: Apr 2005
Location: north-west Indiana
Posts: 747
Trader Rating: 18 (100%+)
Default

Quote:
Originally Posted by UN4RACING
Thats a great method. You are actually balanceing the cells. Bringing them down to an even discharge, a perfect way to start a pack. I like that idea its the first time I've heard it.
I can't take credit for that, it is on the promatch instructions. At least I think it is.
Quote:
Originally Posted by vismund cygnus
Cool, thanks for the tip. Know any good tips for alternating between packs during a race? On Promatch's site, it says you shouldn't run a pack more than twice a night during a race, but I don't know how I'll be able to charge other packs efficiently. Thanks for everyones help so far, I really appreciate it!
I am not quite sure what you are asking. Are you just trying to keep the number of cycles the same, or is it a question of time, or are you asking if you can charge a pack more than twice a race meeting?
trilerian is offline   Reply With Quote
Old 03-11-2007, 02:45 PM   #14
Tech Initiate
 
Join Date: Feb 2007
Location: Harleysville, PA
Posts: 46
Send a message via AIM to Vismund Cygnus
Default

Quote:
Originally Posted by trilerian
I can't take credit for that, it is on the promatch instructions. At least I think it is.

I am not quite sure what you are asking. Are you just trying to keep the number of cycles the same, or is it a question of time, or are you asking if you can charge a pack more than twice a race meeting?
I meant a question of time, sorry about that.
Vismund Cygnus is offline   Reply With Quote
Old 03-11-2007, 10:17 PM   #15
Tech Addict
 
Join Date: Apr 2005
Location: north-west Indiana
Posts: 747
Trader Rating: 18 (100%+)
Default

How many classes are you running, and how long do you have between heats? To be honest, unless you are trying to break track records or looking for that extra 1/10th of a second for the first couple of minutes, your batteries can be charged 30-45 minutes before you use them. So you shouldn't have problems getting batteries charged. If you run more than two classes you may need to buy another charger.
trilerian is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
EP4600 cells charging information Cubic$Racing Electric On-Road 4 06-22-2008 08:33 PM
Charging cells LEE UK Electric On-Road 5 04-17-2006 04:19 PM
Charging Cells while on the CAR inet-projects Electric On-Road 4 11-26-2005 07:47 PM
Charging 8 cells HVAC25000 Electric Off-Road 4 08-26-2005 03:58 PM
Charging 8 cells HVAC25000 Electric On-Road 1 08-23-2005 03:56 PM



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 11:58 PM.


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