R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 08-21-2006, 09:01 AM   #886
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

Good idea, I did not think of that one... I was going to try to bend the end to a 90, but previous ends I have had just break...

Since we are on the subject... One idea for future designs, is to mount the two plugs to the outside of the battery... I have attached a picture for illustration proposes.
Attached Thumbnails
Platinum Lipo-4800lipo_post_loctions.jpg  

Last edited by bvoltz; 08-21-2006 at 09:14 AM.
bvoltz is offline   Reply With Quote
Old 08-21-2006, 09:20 AM   #887
Tech Elite
 
Rick Hohwart's Avatar
 
Join Date: Sep 2003
Posts: 3,935
Default

If they could be done any other way, we would do it. The problem is with the constraints of the Lipo design. The circuit board that allows both terminals to be located on one end is something we designed. Otherwise, the terminals would be on opposite ends. Normally this would not be a problem, but it would have meant the pack would have to be quite a bit longer than it is now.

Since we are trying to make this pack legal for competition, we feel the number on priority is to make it the same overall size as a sub-c pack.

The configuration you have shown would be impossible based on the current size of the battery.
__________________
www.reedypower.com
Rick Hohwart is offline   Reply With Quote
Old 08-21-2006, 09:47 AM   #888
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

No problem, was just an idea, but I see it is not doable...

Thanks....
bvoltz is offline   Reply With Quote
Old 08-21-2006, 11:20 AM   #889
Tech Champion
 
Join Date: Oct 2005
Location: Cincinnati, OH
Posts: 5,360
Trader Rating: 38 (100%+)
Default

I used a couple of these packs for an enduro. The first time we used the fully charged packs they worked great. However if we took the packs off early (like around 3700 mah added) they only lasted about 5-7 min (as opposed to 19 min for a fully charged pack). They also seemed to dump hard after a hit. Is this normal? We used 4 packs between the 2 of us and all 4 packs did it.
or8ital is offline   Reply With Quote
Old 08-21-2006, 11:45 AM   #890
Tech Elite
 
Rick Hohwart's Avatar
 
Join Date: Sep 2003
Posts: 3,935
Default

Quote:
Originally Posted by or8ital
I used a couple of these packs for an enduro. The first time we used the fully charged packs they worked great. However if we took the packs off early (like around 3700 mah added) they only lasted about 5-7 min (as opposed to 19 min for a fully charged pack). They also seemed to dump hard after a hit. Is this normal? We used 4 packs between the 2 of us and all 4 packs did it.
Fully charged will always give more run time, but hard to say what you should get with partially charged packs.

I have raced MANY enduros, and one thing you will experience once you have done a few is that run time will decrease as the race rolls on. The batteries may not change over the course of the race, but motors and other chassis parts wear, ESCs heat up, and your overall package loses efficiency.

You could have experienced some of this along with running reduced battery capacity. Less run time is the result.

I have never experienced the hard dumping. But I have with NiMH. if you are close to the end your run, a hit (or start from stopped) can cause very high ampdraw that will kill the battery.

It is not so important now because NiMH batteries are so good, but in the past a crash or two could easily lead to dumping before the race ends. And a crash in the last minute of the race was the last thing you wanted to do.

To me, nothing sounds abnormal.
__________________
www.reedypower.com
Rick Hohwart is offline   Reply With Quote
Old 08-29-2006, 04:36 PM   #891
Tech Addict
 
MrBlack's Avatar
 
Join Date: Jul 2006
Location: OC
Posts: 746
Default

Quote:
Originally Posted by azmio
guys,

I am thinking about balancing my platinum lipo using my avionics charger via the 2mm male pin. should I set the charger to 3.7 or 7.4 volt?
i am assuming you are usig a proper balancer? if so you set it to the same you would as if you where charging it.

If you are trying to balance it manually (i.e. charging one side at a time) we do not recommend this as it can cause more harm then good if not done properly. Also we have yet to see a single Orion li-po pack go out of balance so I would ask why you feel the need to balance your pack? Have you checked it has it shown signs of balance issues?

Balancing it does give any performance advantage unless the pack has gone out of balance from abuse or neglect in the first place.

We have run batteries weekly for over a year and have not yet seen a need for balancing.

*Note I can only speak of our Orion/Kokam Lipo's not for other brands.
__________________
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 08-29-2006, 06:33 PM   #892
Tech Regular
 
Join Date: Jul 2004
Location: Kuala Lumpur Malaysia
Posts: 278
Default

Mr Black,

I read somewhere stating that the platinum lipo may need balancing only after 30 runs. Whether it needs one or does not need one, I am not an expert to determine that.

Since the port is available there, I dont see any harm to balance it. After I charge them individually, I tend to agree with you that it does not make any different. Each balancing requires almost the same amount of energy to reach the peak.
azmio is offline   Reply With Quote
Old 08-30-2006, 02:01 AM   #893
Tech Adept
 
TEAM-AE-4-EVER's Avatar
 
Join Date: Dec 2004
Location: CALIFORNIA
Posts: 202
Default

Rick - Congrats on your move to The A-TEAM! You will be a great addition to both the On-Road and Off-Road squads... and not to mention helping out with the testing and development of the new AE belted Touring Car!


I am considering buying a few Li-po packs and the Advantage charger... but was wondering if or when you guys might release a saddle pack version that would fit most 4wd Off-Road kits now... especially my BJ4-WE!


THANKS!
TEAM-AE-4-EVER is offline   Reply With Quote
Old 08-30-2006, 09:32 AM   #894
Tech Elite
 
Rick Hohwart's Avatar
 
Join Date: Sep 2003
Posts: 3,935
Default

We are looking into it. But the reality is that the saddle market is relatively small and includes mostly racing type cars. Once we can see that LiPo legality is inevitable, we will proceed with something.
__________________
www.reedypower.com
Rick Hohwart is offline   Reply With Quote
Old 08-30-2006, 10:25 AM   #895
Tech Elite
 
duneland's Avatar
 
Join Date: Sep 2004
Location: NW Indiana, USA
Posts: 2,403
Default

I would like to add my request for a saddle version! Some observations; Most tracks in my area allow LiPo (at least in mod classes), Lipo is perfectly suited to larger on-road tracks where nitro 1/10 & 1/8 cars are run (my tc is a 'saddle pack' car & has been collecting dust for years. Wouldn't mind putting a Quark esc & 4t bl motor in it!)
duneland is offline   Reply With Quote
Old 08-30-2006, 04:21 PM   #896
Tech Champion
 
YR4Dude's Avatar
 
Join Date: Sep 2004
Location: So Cal
Posts: 5,625
Trader Rating: 44 (100%+)
Default

Quick question just to confirm.

I've read that the platnum Lipo is very efficient such that it has:

Low IR
High voltage
Develops little heat when used.

So given the last fact, does that mean it can be charged immediately after being used without the need for cooling like NiMh?

Also, I had heard it mentioned that in regards to its performance (volts), it doesn't matter whether it is fully charged or partially charged. Is this true?

Lastly, Mr Black mentioned on the KO race thread that one Platnum is equivalent to three good NiMh packs. If I had one Platnum and the Orion charger would I be able to last the whole race weekend on it? Also would I always be ready to run between practice sessions (5min.) and heats at almost anytime in the event so long as I keep the battery charging while it is idle on my pit table?

Thanks.
YR4Dude is offline   Reply With Quote
Old 08-30-2006, 04:26 PM   #897
Tech Elite
 
Rick Hohwart's Avatar
 
Join Date: Sep 2003
Posts: 3,935
Default

Quote:
Originally Posted by YR4Dude
Quick question just to confirm.

I've read that the platnum Lipo is very efficient such that it has:

Low IR
High voltage
Develops little heat when used.

So given the last fact, does that mean it can be charged immediately after being used without the need for cooling like NiMh?

Also, I had heard it mentioned that in regards to its performance (volts), it doesn't matter whether it is fully charged or partially charged. Is this true?

Lastly, Mr Black mentioned on the KO race thread that one Platnum is equivalent to three good NiMh packs. If I had one Platnum and the Orion charger would I be able to last the whole race weekend on it? Also would I always be ready to run between practice sessions (5min.) and heats at almost anytime in the event so long as I keep the battery charging while it is idle on my pit table?

Thanks.
You can, and should, charge (to at least 25%) your battery right after it comes off the track.

Fully charged or partially charged can make some difference but it is very small; especially when compared to NiMH. Charging the pack an hour, day, or week before use makes no difference.

You should be able to do the whole event on one pack. If you race modifed, you will be more pressed for time than if you race mini. But even so, the battery should reach at least 80% capacity which will give you more than enough capacity for even a modified heat.
__________________
www.reedypower.com
Rick Hohwart is offline   Reply With Quote
Old 08-30-2006, 04:35 PM   #898
Tech Addict
 
MrBlack's Avatar
 
Join Date: Jul 2006
Location: OC
Posts: 746
Default

Quote:
Originally Posted by YR4Dude
Quick question just to confirm.


So given the last fact, does that mean it can be charged immediately after being used without the need for cooling like NiMh?
Yes this is correct.

Quote:
Originally Posted by YR4Dude
Also, I had heard it mentioned that in regards to its performance (volts), it doesn't matter whether it is fully charged or partially charged. Is this true?
A lipo battery will hold it voltage for much much longer then a traditional Ni-MH cell so if you had it charged at 90% you would not notice any power difference then being charged at 100%. We always recommend runing the battery after fully charged to allow maximum runtime and the longest lifespan

Quote:
Originally Posted by YR4Dude
Lastly, Mr Black mentioned on the KO race thread that one Platnum is equivalent to three good NiMh packs. If I had one Platnum and the Orion charger would I be able to last the whole race weekend on it? Also would I always be ready to run between practice sessions (5min.) and heats at almost anytime in the event so long as I keep the battery charging while it is idle on my pit table?
One Platinum can be run without any wait between charging so a user can use one battery to run all day with charging between runs. For most racers atleast three pack of a Ni-MH battery would be required to race per day.

The capacity of a 4800 Lipo is equivilent in runtime to about a 6600mAh Ni-MH if one existed and in some applications will give almost twice the over all run time over a standard 4300 without the drop off in performance.

We have had many customers call us who run 2WD buggies and will run 3-4 5min. runs before recharging. For touring and Mod motors this is obviuosely different and it veries by application. However on average the a Li-Po battery will give 30-40% more runtime then it's equivilent Ni-MH.

I personally have run a Touring Car with a 23T motor for over 30 min. with a 4800 Lipo before any power loss was noticed.
__________________
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 08-30-2006, 04:47 PM   #899
Tech Champion
 
YR4Dude's Avatar
 
Join Date: Sep 2004
Location: So Cal
Posts: 5,625
Trader Rating: 44 (100%+)
Default

Thanks guys.

That is absolutely amazing. An entire "Big Race" weekend on only one charger and and one battery pack without any loss in power. Thats is definitely technology working to improve this sport. I look forward to the release of the competition version when it comes out next month.
YR4Dude is offline   Reply With Quote
Old 09-01-2006, 01:06 PM   #900
Tech Master
 
padailey's Avatar
 
Join Date: Nov 2005
Location: Council Bluffs, IA
Posts: 1,603
Trader Rating: 11 (100%+)
Default

I am about to dive into the lipo world after doing a lot of reading. I have not been following this thread from the beginning but have recently read the whole thing. My main question is the about low voltage cutoffs. I think the main thought here is they are not needed because you will feel it in plenty of time. Although I believe you I'm still a little concerned because of not having a lipo before and don't want to ruin it. Can anyone tell me approximately where the voltage is when the power begins to drop off? If it starts to drop off at 3.3 per cell for example I could see where the LVC isn't really necessary. Sorry if this has been answered before but the 30 pages of posts are kinda a blur.
__________________
www.hobbyplexraceway.com

Tamiya TRF417X (Lion's Automotive GTR)
Tamiya TRF416X
Tamiya F104W MP6/4 converted to F104X1 (Renault R30)
padailey is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
ORION PLATINUM 4800 LIPO sedanracer8 R/C Items: For Sale/Trade 21 12-18-2007 08:09 PM
>>> Orion Platinum 4800 Lipo <<< rraden R/C Items: For Sale/Trade 9 10-22-2007 09:55 AM
Is the Mamba Max 7700 to much for the Platinum 4800 Lipo _pilot_ Electric On-Road 2 10-10-2007 01:52 PM
Team Orion Platinum Lipo Pack danjoy25 Australia For Sale/Trade 0 05-10-2006 04:26 PM
FS Orion Platinum Lipo!!! Glowster21 R/C Items: For Sale/Trade 20 04-05-2006 06:37 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 02:36 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