R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 02-27-2008, 09:01 PM   #1
Tech Master
 
VenturaDC's Avatar
 
Join Date: Oct 2007
Location: Ventura, SoCal
Posts: 1,131
Trader Rating: 32 (100%+)
Default Hot Batts, more or less amps

after charging my ep3600's they get pretty freakin hot, someone told me that i should up the amperage so they get charged before having time to heat up, but i just wanted to know from more then one person what the right thing would be to do, Im using a duratrax intellipeak digital at 5amps right now, should i go to 6 or should i go lower then 5?

thanks for any help

DC
VenturaDC is offline   Reply With Quote
Old 02-27-2008, 10:23 PM   #2
Tech Adept
 
Sidewayzzzz's Avatar
 
Join Date: Jul 2007
Posts: 132
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by VenturaDC View Post
after charging my ep3600's they get pretty freakin hot, someone told me that i should up the amperage so they get charged before having time to heat up, but i just wanted to know from more then one person what the right thing would be to do, Im using a duratrax intellipeak digital at 5amps right now, should i go to 6 or should i go lower then 5?

thanks for any help

DC
Higher Amp will make it even hotter and kill the battery faster.
For NiMH should charge at 1C or max about 1.5C. Unless it's for race and you do not want to reuse the battery.
What you should do is the reduce the peak sensitivity. for new battery, set peak sensitivity around 3-4mAh per cell.
You can also set the temperature to around 50 deg C so that it will peak once it reach 50 deg C. You can place the probe at the hottest cell if you know which one is the hottest.
__________________
TRF415 | M03R | TA05R | F103GT | TT01 | Cyclone S | Cyclone WCE
Sidewayzzzz is offline   Reply With Quote
Old 02-27-2008, 10:34 PM   #3
Tech Elite
 
kschu's Avatar
 
Join Date: Mar 2007
Location: Kota Kinabalu,Sabah
Posts: 4,598
Trader Rating: 16 (100%+)
Send a message via MSN to kschu
Default

i think u need to lower your amp when charging...4.5a

another alternative is blow ur battery with fan while charging...this will make d cell from overheating ...
__________________
Give the best while u can !
kschu is offline   Reply With Quote
Old 02-27-2008, 11:09 PM   #4
Tech Adept
 
Sidewayzzzz's Avatar
 
Join Date: Jul 2007
Posts: 132
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by kschu View Post
i think u need to lower your amp when charging...4.5a

another alternative is blow ur battery with fan while charging...this will make d cell from overheating ...
Actually blowing with fan is not recommended.
When you cool the battery, it will not peak naturally, peaking later than usual and may cause it to be overcharged, damaging battery in process.
__________________
TRF415 | M03R | TA05R | F103GT | TT01 | Cyclone S | Cyclone WCE
Sidewayzzzz is offline   Reply With Quote
Old 02-28-2008, 12:30 AM   #5
Tech Elite
 
razzor's Avatar
 
Join Date: Aug 2005
Location: Durban, South Africa
Posts: 2,810
Default

Cooling the battery with a fan is a nono when charging but can be used after the charge or after use.
Charging up to 6amps is fine but drop the delta peak sensitivity to 3mv/0.3V and also lower temp cutoff to 46/47 deg/c.
This should keep you safe.
__________________
Casterracing ZX1.5R
casterracing EX-1 Pro, SP Silver Arrow
TOP Racing Scythe, SP 17.5, SP GT Pro 2.0
TOP Racing Scythe, SP 4.5 V2, Hobbywing Xerun 120SD 2.0
TOP Racing Scythe, SP 13.5, Hobbywing Xerun 120SD 2.0
razzor is offline   Reply With Quote
Old 02-28-2008, 03:51 AM   #6
Tech Adept
 
Join Date: Sep 2006
Posts: 187
Default

I've been using a powerful fan for years now and never had problems. I always use a 3mV peak setting and my batt's always peak when they should, even when they are at room temp.
_pilot_ is offline   Reply With Quote
Old 02-28-2008, 05:44 AM   #7
Tech Adept
 
Join Date: Aug 2007
Posts: 234
Default

Quote:
Originally Posted by _pilot_ View Post
I've been using a powerful fan for years now and never had problems. I always use a 3mV peak setting and my batt's always peak when they should, even when they are at room temp.
I would not use a fan while charging... If you are you are not getting top performance out of you cells.
Jeremy Otis is offline   Reply With Quote
Old 02-28-2008, 07:08 AM   #8
Tech Adept
 
bboy's Avatar
 
Join Date: Feb 2008
Location: CA
Posts: 218
Default

5A is really the max you want for your battery. Also check to make sure there is no dead cell since they will lead to a false peak especially when you reduce to 3mv.
__________________
Serpent 960-08 + Max XL9
XRay NT1 + Max XXL3
bboy is offline   Reply With Quote
Old 02-28-2008, 08:03 AM   #9
Tech Adept
 
Join Date: Sep 2006
Posts: 187
Default

Quote:
Originally Posted by Jeremy Otis View Post
I would not use a fan while charging... If you are you are not getting top performance out of you cells.
You're right, I don't get max performance, on average they probablly take 200-300 fewer mah. The reason I use a fan is cold cells don't explode, they don't get hot so there is no pressure build up in the cell. After seeing (and being near) many subC big bangs I tend to err on the side of caution.
_pilot_ is offline   Reply With Quote
Old 02-28-2008, 08:40 AM   #10
Tech Elite
 
razzor's Avatar
 
Join Date: Aug 2005
Location: Durban, South Africa
Posts: 2,810
Default

i know that feeling, anticipating the next bang.
Dont put a fan on the cells and drop the delta cutoff to 3mv you should be good.
If by some remote chance a cell vents just remember to get it on the floor ASAP or covered with something and do it fast as soon as you hear the hiss.
__________________
Casterracing ZX1.5R
casterracing EX-1 Pro, SP Silver Arrow
TOP Racing Scythe, SP 17.5, SP GT Pro 2.0
TOP Racing Scythe, SP 4.5 V2, Hobbywing Xerun 120SD 2.0
TOP Racing Scythe, SP 13.5, Hobbywing Xerun 120SD 2.0
razzor is offline   Reply With Quote
Old 02-28-2008, 04:54 PM   #11
Tech Champion
 
morris's Avatar
 
Join Date: Nov 2005
Location: jersey shore pa
Posts: 5,564
Trader Rating: 40 (100%+)
Default

i have a quick question....i was reading this thread and was curious about my chargers.i have 2 lrp quantam comp chargers...now when you all say to set the charger at say 3mv do you meen delta peak.i was looking thrue my chargers and they were both set-up at 15mv....but they only go down to 5mv.i have used these chargers for awhile now and i have never had any issues with charging.i dont think i have ever heard a pack vent.....but then again its pretty noisy at the races...

lmk for i am curious about my set-up.

thx,
matt
__________________
AE/VIPER/XPERT/DIRTCHEAPRC.COM/JCONCEPTS
A big thx to all the tracks that I race at:cause if it wasnt for these guys..we wouldnt have a place to race our r/c cars!!!
morris is offline   Reply With Quote
Old 02-28-2008, 07:09 PM   #12
Tech Adept
 
Sidewayzzzz's Avatar
 
Join Date: Jul 2007
Posts: 132
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by morris View Post
i have a quick question....i was reading this thread and was curious about my chargers.i have 2 lrp quantam comp chargers...now when you all say to set the charger at say 3mv do you meen delta peak.i was looking thrue my chargers and they were both set-up at 15mv....but they only go down to 5mv.i have used these chargers for awhile now and i have never had any issues with charging.i dont think i have ever heard a pack vent.....but then again its pretty noisy at the races...

lmk for i am curious about my set-up.

thx,
matt
most likely it is 15mv for the whole pack ie 6cells. not individual cell delta peak.

for 3mv per cell, the delta peak for whole pack will be 18mv
__________________
TRF415 | M03R | TA05R | F103GT | TT01 | Cyclone S | Cyclone WCE
Sidewayzzzz is offline   Reply With Quote
Old 02-29-2008, 06:23 AM   #13
Tech Champion
 
morris's Avatar
 
Join Date: Nov 2005
Location: jersey shore pa
Posts: 5,564
Trader Rating: 40 (100%+)
Default

Quote:
Originally Posted by Sidewayzzzz View Post
most likely it is 15mv for the whole pack ie 6cells. not individual cell delta peak.

for 3mv per cell, the delta peak for whole pack will be 18mv
so do you think it will be fine to leave it at 15mv.or sohuld i raise it to 20mv?
__________________
AE/VIPER/XPERT/DIRTCHEAPRC.COM/JCONCEPTS
A big thx to all the tracks that I race at:cause if it wasnt for these guys..we wouldnt have a place to race our r/c cars!!!
morris is offline   Reply With Quote
Old 02-29-2008, 06:36 AM   #14
Tech Elite
 
razzor's Avatar
 
Join Date: Aug 2005
Location: Durban, South Africa
Posts: 2,810
Default

I had the same question when i used a buddies Supernova charger and since its a very similar software to the ICE and Checkpoint i noticed that it didnt go lower than 5mv compared to the checkpoint that is set at 3mv.
Id suggest setting it to 5mv.
One other thing to note about teh delta peak is that the higher it is set it will make the packs heat up more and pack more capacity into the battery but for stock the lower setting will be better since the pack peaks with higher voltage.
This is what makes sense to me and i may be corrected .
__________________
Casterracing ZX1.5R
casterracing EX-1 Pro, SP Silver Arrow
TOP Racing Scythe, SP 17.5, SP GT Pro 2.0
TOP Racing Scythe, SP 4.5 V2, Hobbywing Xerun 120SD 2.0
TOP Racing Scythe, SP 13.5, Hobbywing Xerun 120SD 2.0
razzor is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Hot Batts, more or less amps VenturaDC Radio and Electronics 0 02-27-2008 08:24 PM
ESC 600 AMPS LINEAR 1200 AMPS MAX Windbreaker_guy R/C Items: For Sale/Trade 0 07-30-2007 03:49 AM
Amps? 4ou Rookie Zone 7 11-04-2005 07:41 PM
amps dakrat Rookie Zone 14 12-02-2004 02:25 PM
amps smiddy_15 Electric Off-Road 2 06-03-2002 11:53 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 09:06 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net