Go Back  R/C Tech Forums > General Forums > Electric On-Road
 3300 Battery Running Flat >

3300 Battery Running Flat

3300 Battery Running Flat

Reply

Old 04-17-2004, 04:34 PM
  #1  
Tech Adept
Thread Starter
 
noline's Avatar
 
Join Date: Sep 2001
Posts: 227
Default 3300 Battery Running Flat

I have a question about the 3300 batteries for the first few minutes of the race my car is real fast then the batteries start to run real flat can anyone tell me how I can fix this problem. I'm running a stock motor and I charge the at 6 amps and discharge at 20 amps and then when they cool down I put them on a tray when the lights got out I take them of the tray.Is that how the batteries are.
noline is offline  
Reply With Quote
Old 04-17-2004, 05:37 PM
  #2  
Tech Addict
 
Fire's Avatar
 
Join Date: Oct 2001
Location: Vancouver BC Canada
Posts: 703
Default

you may try 30amp discharge
do not tray before put away the packs
tray before charge
charge immediately after tray
Fire is offline  
Reply With Quote
Old 04-17-2004, 07:24 PM
  #3  
Tech Regular
iTrader: (2)
 
Join Date: Dec 2003
Location: Rochester, NY
Posts: 442
Trader Rating: 2 (100%+)
Default

when you charge your pack, does one or more of the cells seem extremely hotter than the rest?
MManson is offline  
Reply With Quote
Old 04-17-2004, 08:09 PM
  #4  
Tech Regular
 
Matt04's Avatar
 
Join Date: May 2003
Location: Sydney
Posts: 300
Default

if 1 cell is cold and the rest is hot u may have a dead cell.
Matt04 is offline  
Reply With Quote
Old 04-17-2004, 10:01 PM
  #5  
Tech Regular
 
Join Date: Nov 2003
Location: North Wales, PA
Posts: 352
Default

how old are these packs?? do you deadshort??? u might have lose SUBSTANTIAL LOSS of runtime... IDK
FriedDiff is offline  
Reply With Quote
Old 04-17-2004, 11:37 PM
  #6  
Tech Adept
 
Java1970's Avatar
 
Join Date: Mar 2004
Location: VERY Northern California
Posts: 164
Default

Stick packs are notorious for having a "dead" or "vented" cell. The one pack I saw do the same thing, was charged the first time over the recommended charge rate (about 3 amps for NiHm, 4.5 amps for NiCd max!!!) and had been over discharged after the run. Most chargers are set to auto detect the proper amprage for charging, the adjustible ones should have the recommended range on the face or in the manual. Contact the manufacturer of the battery to be certain, but charging it at 6 amps is double the recommended rate and probably ruined the cells.
Java1970 is offline  
Reply With Quote
Old 04-18-2004, 05:08 AM
  #7  
Tech Champion
iTrader: (17)
 
Jon Kerr's Avatar
 
Join Date: Jul 2002
Location: San Diego
Posts: 9,659
Trader Rating: 17 (100%+)
Default

Originally posted by Java1970
Stick packs are notorious for having a "dead" or "vented" cell. The one pack I saw do the same thing, was charged the first time over the recommended charge rate (about 3 amps for NiHm, 4.5 amps for NiCd max!!!) and had been over discharged after the run. Most chargers are set to auto detect the proper amprage for charging, the adjustible ones should have the recommended range on the face or in the manual. Contact the manufacturer of the battery to be certain, but charging it at 6 amps is double the recommended rate and probably ruined the cells.
If these are GP3300 cells, we reccomend charging at 6 amps. A 3 amp charge would give you very flat cells for a long run time. That's not what you want in stock racing. I have teammates that charge at MUCH higher rates than that. It sounds to me like the problem may be the tray. What tray are you using? If it's one without an auto cutoff and you're just undoing each cell as the lights go out, you're not really equalizing the cells. It's a colse estimate. Someone mentioned that you may have a dead cell. That's very possible. Do you have one cell that's going out much earlier than all the others. Some of the trays that don't have a cutoff on them and take the cells down to 0.0v have a tendancy to do that. Especially if you accadently leve them on too long. Also, is this happening on just one pack or all of your packs?

If you're looking for charging/discharging/storing proceedures, just click on the Fukuyama Racing link in my sig. and go to the TECHNICAL INFO section.

As far as a tray goes. I'd reccomend something with an auto cutoff @ .9v. I like the Rayspeed. You can get it from Steve @ www.speedtechrc.com. Novak is also coming out with what looks to be a very nice digial tray as well. As long as they have an auto cut off instead of the watching the bulbs method. If you let one cell go too long you can kill that one cell and flatten the pack.

Hope this helps.
Jon Kerr is offline  
Reply With Quote
Old 04-18-2004, 09:46 AM
  #8  
Tech Elite
iTrader: (1)
 
Join Date: Oct 2003
Location: Green Bay,WI
Posts: 3,006
Trader Rating: 1 (100%+)
Default

if i charged at 3 amps i think id miss the qualifiers being it takes so long to charge...but anyways i charge at 6 like Fukuyama prefers
R/C Anonymous is offline  
Reply With Quote

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


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service