R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 03-15-2007, 08:27 AM   #931
Tech Addict
 
Iceracer's Avatar
 
Join Date: Feb 2006
Location: Canada
Posts: 656
Trader Rating: 1 (100%+)
Default

Any opinions on the Integy Indi 16x307 charger?

http://www2.towerhobbies.com/cgi-bin...p?&I=LXPPD3&P=

At $54.00 it looks like a real bargain, charging at up to 6.5 amp rate.
Iceracer is offline   Reply With Quote
Old 03-15-2007, 08:50 AM   #932
Tech Adept
 
Join Date: Sep 2004
Posts: 179
Default

Quote:
Originally Posted by Iceracer
Any opinions on the Integy Indi 16x307 charger?

http://www2.towerhobbies.com/cgi-bin...p?&I=LXPPD3&P=

At $54.00 it looks like a real bargain, charging at up to 6.5 amp rate.
I like the 6.5 amp available charge rate, and the fact that you can choose to charge only to 4.15...if cycles are more important to you than full power. However, I'm concerned it could be too easy to bump the amp wheel and fry a battery. Also, it doesn't have any built in balancing. You could use an external balancer, but that costs more, and depending on the balancer, you'd lose the option of the 4.15 peak (some balancers only balance when cells hit close to the 4.2v rate....some do continuous balancing during the charge cycle.)

In general I think this could be called a "stupid" charger...and that can allow you to be stupid and ruin a battery. All this charger does is charge at constant amperage based on the settings you chose (cell count, amp rate.) It doesn' attempt to determine the true cell count or battery size. In comparison the CellPro automatically calculates the cell count and automatically determines the battery capacity and then automatically sets the charge rate based on the 1C rule. The CellPro is idiot proof and I've been known to be an idiot now and again.
Disaster is offline   Reply With Quote
Old 03-15-2007, 09:07 AM   #933
Tech Addict
 
Iceracer's Avatar
 
Join Date: Feb 2006
Location: Canada
Posts: 656
Trader Rating: 1 (100%+)
Default

Good points Disaster.

How does auto current sensing work? How does the charger know you've plugged it into a 700mah or a 4800mah lipo cell?
Iceracer is offline   Reply With Quote
Old 03-15-2007, 09:19 AM   #934
Tech Adept
 
Join Date: Sep 2004
Posts: 179
Default

Quote:
Originally Posted by Iceracer
Good points Disaster.

How does auto current sensing work? How does the charger know you've plugged it into a 700mah or a 4800mah lipo cell?
That is a good question.

When I watch the Cellpro display during startup it will slowly increase the charge rate, then decrease it back slightly and hold it at that level. I'm guessing it is some sort of logic, similar to delta peak based on the voltage that must be applied to get the constant current. After a minute or two of this feedback it determines what the capacity must be and then it gives you a percentage charged. Lipos charge/discharge rate is affected by temperature and it has a built in thermistor which it probably uses to improve the accuracy (as well as protecting against overcharging in cold climate.)

Unfortunately the Cellpro is limited to 3 amps....which is good enough for my current batteries...barely. Hope they come out with a more powerful model in the next year or so.
Disaster is offline   Reply With Quote
Old 03-15-2007, 12:32 PM   #935
Tech Regular
 
Mike Schumacher's Avatar
 
Join Date: Nov 2005
Location: RC Madness, CT
Posts: 278
Trader Rating: 36 (100%+)
Default

What is CellPro? Any link? Also, any good balancer you guys recommend?
__________________
◄◄ ★ ☆ ★ ☆ ★ ☆ ★ ☆ ★ ☆ ★ ☆ ★ ☆ ★ ☆ ★ ☆ ★ ☆ ★ ☆ ★ ☆ ★ ☆ ★ ►►
Mike Schumacher is offline   Reply With Quote
Old 03-15-2007, 12:35 PM   #936
Tech Addict
 
MrBlack's Avatar
 
Join Date: Jul 2006
Location: OC
Posts: 746
Default

Quote:
Originally Posted by sim600
MrBlack,
Glad you are on here. In the instructions that came with the 3200 Carbon LiPo, it says to charge it between 2amps and 3.2amps. What happens if we charge it at under 2amps with a LiPo charger? Thanks.
THis depends on the charger many chargers that top out at 1.5Amps have shown to not fully charger the battery also those that do take upwards of 2 hours to chrge the cell properly and having a charger running hard for 2 hours straight can prematurely burn up the charger.
__________________
TEAM ORION - AVIONICS - KYOSHO - KO PROPO - PEAK

"Racing is about the journey not the destination if it wasn't it would simply be called Arriving"

"The solution is people need to spend more of their efforts on promoting and finding more people to race with, rather then a personal quest to form a class that they can win at."
MrBlack is offline   Reply With Quote
Old 03-15-2007, 12:56 PM   #937
Tech Adept
 
Join Date: Sep 2004
Posts: 179
Default

Quote:
Originally Posted by Mike Schumacher
What is CellPro? Any link? Also, any good balancer you guys recommend?
Here is a link to the CellPro. It is a great charger up to about 3000-3500mAh batteries. If you charge a 4400mAh battery with it, it will take about an hour and a half to charge vs. 1 hour, 4 minutes, for the 3200mAh battery. It won't hurt the charger according to FMA Direct...just take longer.

The Cellpro automatically balances as it charges so you don't need a separate balancer. You will need to buy or make an adapter, depending on what brand of Lipo you have.

http://www.fmadirect.com/products.htm?cat=45&nid=4
Disaster is offline   Reply With Quote
Old 03-16-2007, 08:49 AM   #938
Tech Addict
 
MrBlack's Avatar
 
Join Date: Jul 2006
Location: OC
Posts: 746
Default

Quote:
Originally Posted by linger
Hopefully, Cliff will be able to share results of 2C charging of cells greater than 2000mAh.
I have just gotten the graph this morning from Kokam, here is a chart showing the 3.2A (3200) cells being tested at 2C charge rates:
Attached Thumbnails
Team Orion 3200mAh Race Spec LiPo-2c_descharge.gif  
__________________
TEAM ORION - AVIONICS - KYOSHO - KO PROPO - PEAK

"Racing is about the journey not the destination if it wasn't it would simply be called Arriving"

"The solution is people need to spend more of their efforts on promoting and finding more people to race with, rather then a personal quest to form a class that they can win at."
MrBlack is offline   Reply With Quote
Old 03-16-2007, 09:01 AM   #939
Tech Champion
 
Join Date: Oct 2005
Location: Cincinnati, OH
Posts: 5,360
Trader Rating: 38 (100%+)
Default

Quote:
Originally Posted by MrBlack
I have just gotten the graph this morning from Kokam, here is a chart showing the 3.2A (3200) cells being tested at 2C charge rates:
So Im confused. This suggests that charging at 2C doesnt rapidly deteriorate the cells (contrary to lingers chart)?? Can someone interpret for me?
or8ital is offline   Reply With Quote
Old 03-16-2007, 09:12 AM   #940
Tech Adept
 
Join Date: Sep 2004
Posts: 179
Default

Quote:
Originally Posted by MrBlack
I have just gotten the graph this morning from Kokam, here is a chart showing the 3.2A (3200) cells being tested at 2C charge rates:
Wow, that is pretty incredible performance...especially compared to Linger's results. Is that a new technology or the stuff they are already using?
Disaster is offline   Reply With Quote
Old 03-16-2007, 09:15 AM   #941
Tech Addict
 
Iceracer's Avatar
 
Join Date: Feb 2006
Location: Canada
Posts: 656
Trader Rating: 1 (100%+)
Default

Mr Black, how does that compare to 1C charge over the same # of cycles?
Iceracer is offline   Reply With Quote
Old 03-16-2007, 11:11 AM   #942
Tech Master
 
linger's Avatar
 
Join Date: Aug 2001
Location: Retired
Posts: 1,132
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by or8ital
So Im confused. This suggests that charging at 2C doesnt rapidly deteriorate the cells (contrary to lingers chart)?? Can someone interpret for me?
It just means that the larger kokam cells are a lot more resistant to higher charge rates compared to the smaller kokam cells. Thanks for the info Cliff.
__________________
I used to be a spitter, now I'm a swallower. I graduated.
linger is offline   Reply With Quote
Old 03-16-2007, 11:37 AM   #943
Tech Addict
 
MrBlack's Avatar
 
Join Date: Jul 2006
Location: OC
Posts: 746
Default

Quote:
Originally Posted by Iceracer
Mr Black, how does that compare to 1C charge over the same # of cycles?
1C is still better but not by as much as you would think.
__________________
TEAM ORION - AVIONICS - KYOSHO - KO PROPO - PEAK

"Racing is about the journey not the destination if it wasn't it would simply be called Arriving"

"The solution is people need to spend more of their efforts on promoting and finding more people to race with, rather then a personal quest to form a class that they can win at."
MrBlack is offline   Reply With Quote
Old 03-16-2007, 11:39 AM   #944
Tech Addict
 
MrBlack's Avatar
 
Join Date: Jul 2006
Location: OC
Posts: 746
Default

Quote:
Originally Posted by linger
It just means that the larger kokam cells are a lot more resistant to higher charge rates compared to the smaller kokam cells. Thanks for the info Cliff.
Ling is correct the larger cells have the ability to take more abuse then the smaller cells due to increased capacity.

This is one of the reasons why we try and use fewer larger cells then assemblies that use several smaller cells such as those found in laptop batteries which do not require the amp draw that our cars do.
__________________
TEAM ORION - AVIONICS - KYOSHO - KO PROPO - PEAK

"Racing is about the journey not the destination if it wasn't it would simply be called Arriving"

"The solution is people need to spend more of their efforts on promoting and finding more people to race with, rather then a personal quest to form a class that they can win at."
MrBlack is offline   Reply With Quote
Old 03-16-2007, 11:45 AM   #945
Tech Champion
 
Join Date: Oct 2005
Location: Cincinnati, OH
Posts: 5,360
Trader Rating: 38 (100%+)
Default

So in the experts opinions am I ok to charge at 2c (6.4A)?
or8ital is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
NIP Team Orion 3200Mah Lipo Race Pack limbohz R/C Items: For Sale/Trade 0 05-30-2008 10:36 AM
Peak 3200mah carbon spec lipo aus jd 2703 Australia For Sale/Trade 8 04-23-2008 09:12 PM
Team Orion Carbon Edition 3200mAh LiPo squearl R/C Items: For Sale/Trade 7 03-11-2008 06:35 AM
Team Orion Carbon Edition 3200mAh lipo batteries dido41 R/C Items: Wanted to Buy 3 07-26-2007 04:10 PM
2 Team Orion Carbon Edition 3200mAh LiPo Batteries CCristo R/C Items: For Sale/Trade 1 05-04-2007 11:48 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 04:06 PM.


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