R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 12-17-2008, 01:14 AM   #1
Tech Master
 
wingman2's Avatar
 
Join Date: Dec 2005
Location: Tewkesbury, UK via Plymouth, UK.
Posts: 1,259
Default Why choose LiPo?

Hi guys,

I am in the market to buy some new race packs and chargers. Before I go out and get 5x packs of IB's, or EP's or similar, and chargers for them, what are the merits of going to LiPo?

I know IB's have had a tough time recently with regards to life expectancy, but I don't know enough about LiPo's to make the change. What are the 'balancer's' for? How long do they take to charge? Why do I see a burn bag for them (never seen that for IB's, etc!)?

I just want to know the merits of LiPo's before making the change to them!

I hope that all makes sense guys and I look forward to reading your replies.

All the best,

Chris.
wingman2 is offline   Reply With Quote
Old 12-17-2008, 03:11 AM   #2
Tech Adept
 
Join Date: Apr 2008
Posts: 157
Trader Rating: 21 (100%+)
Default

Quote:
Originally Posted by wingman2 View Post
what are the merits of going to LiPo?
lighter, easier to look after, greater capacity(longer run times) and similar speed.

Quote:
Originally Posted by wingman2 View Post
What are the 'balancer's' for?
"LiPo-Balancers eliminate the problem of cell imbalance, allowing your valueable LiPo packs to reach their maximum life span.
Traditional LiPo protection circuits simply terminate the charge when one cell goes above 4.25 Volts. This gradually reduces pack
capacity because the imbalance slowly increases with each cycle. LiPo Balancers allow the charging process to continue until ALL
cells have reached 4.20V while still protecting each cell from overvoltage."

source: http://www.rcmodels.org/csm/lipoman.PDF

Quote:
Originally Posted by wingman2 View Post
How long do they take to charge?
Similar time to nimh

Quote:
Originally Posted by wingman2 View Post
Why do I see a burn bag for them (never seen that for IB's, etc!)?
Safety precaution, some have "blown up", sort of like all those 4200's that did
l337 is offline   Reply With Quote
Old 12-17-2008, 03:35 AM   #3
Tech Elite
 
Foxxrocket's Avatar
 
Join Date: Jul 2008
Location: Sonoma County
Posts: 2,018
Default

$$$ One well maintained LiPo will last you years. $$$
__________________
Tamiya 416X/ Tamiya TA-05 IFS/ Losi XXX-SCT/ HPI Baja 5SC/ Tamiya M05/ Tamiya F103/ Tamiya F104/ Team Associated 10R5O/ Kyosho IGT2/
Foxxrocket is offline   Reply With Quote
Old 12-17-2008, 04:17 AM   #4
Tech Elite
 
Lonestar's Avatar
 
Join Date: Oct 2001
Location: Switzerland
Posts: 2,367
Trader Rating: 13 (100%+)
Default

There is at least 20 different threads on this forum about nimh vs. lipo...

I think the real question now is

"why the heck stick to NiMH if the track you run at allows lipo and you can afford buying a lipo charger?"

Paul
__________________
When the flag drops, the BS stops.

The train stops at the train station. The bus stops at the bus station. In my office I have a workstation.
Lonestar is offline   Reply With Quote
Old 12-17-2008, 04:41 AM   #5
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

Lipo is a long term investment....u wont need to discharge them all u need to do is balance charge them....

the punch will never drop even for few months u using....going Lipo is totally a good decision....
__________________
Give the best while u can !
kschu is offline   Reply With Quote
Old 12-17-2008, 04:51 AM   #6
Tech Master
 
cheehtae's Avatar
 
Join Date: Apr 2005
Posts: 1,470
Trader Rating: 15 (100%+)
Default

Quote:
Originally Posted by Lonestar View Post
There is at least 20 different threads on this forum about nimh vs. lipo...

I think the real question now is

"why the heck stick to NiMH if the track you run at allows lipo and you can afford buying a lipo charger?"

Paul
+1
cheehtae is offline   Reply With Quote
Old 12-17-2008, 07:12 AM   #7
Tech Regular
 
Join Date: Jan 2006
Posts: 455
Trader Rating: 1 (100%+)
Default

There is one negitive...you must never discharge them too low, you must have some kind of cutoff that will stop the car if the voltage gets too low.
This is not too big a deal during a 5-6 minute race but is a very big deal if you are bashing or if you are just running laps.
cherokee is offline   Reply With Quote
Old 12-17-2008, 07:48 AM   #8
Regional Moderator
 
Darkseid's Avatar
 
Join Date: Aug 2001
Location: At my computer, duh...
Posts: 9,033
Trader Rating: 8 (100%+)
Default

Quote:
Originally Posted by Lonestar View Post
I think the real question now is

"why the heck stick to NiMH if the track you run at allows lipo and you can afford buying a lipo charger?"

Paul
That pretty much says it all...
__________________
TLR 22...Tamiya F104...
Darkseid is offline   Reply With Quote
Old 12-17-2008, 07:54 AM   #9
Tech Master
 
rcterp's Avatar
 
Join Date: Oct 2008
Location: No mans land.
Posts: 1,032
Trader Rating: 35 (100%+)
Default

Lipo was the reason I got back into electric racing. It is a little bit more expensive up front (not nearly as bad as some people think); but for convenience and longevity it is in a class of it's own.

They are easy to charge - plug the pack into the balancer, the balancer into the charger and start it..... easy.

They run FOREVER - upwards of 30 minutes per pack.

Do a little research on what you can afford and buy Lipo, leave NiMH behind, it'll be more than worth it.
rcterp is offline   Reply With Quote
Old 12-17-2008, 09:19 AM   #10
Tech Elite
 
Toh WL's Avatar
 
Join Date: May 2006
Location: Setapak
Posts: 3,567
Trader Rating: 6 (100%+)
Default

Well I say LiPO & brushless bring electric powered cars back to business. I hate brush motors due to high maintainance cost & tedious maintainance routine. I also hate NiMH pack cause they are not easy to maintain & cost.

But if you are using NiMH, you need to replace your charger which supports LiPo. This except if your charger can support it.
Toh WL is offline   Reply With Quote
Old 12-17-2008, 09:28 AM   #11
Tech Elite
 
Join Date: Jul 2005
Location: Philadelphia, PA
Posts: 3,121
Trader Rating: 32 (100%+)
Send a message via AIM to A. Rhodes
Default

One nice thing about lipos is being able to charge them up, put them away for a couple of months, and then just put them in your car and run. You could never do that with NIMH. Lipo and BL has deffinately helped save the on-road scene, but it is still in a decline
__________________
Retired from RC....
Quantum - St. Croix - Bass Pro Shops - XPS - Rapala
A. Rhodes is offline   Reply With Quote
Old 12-17-2008, 04:00 PM   #12
Tech Master
 
wingman2's Avatar
 
Join Date: Dec 2005
Location: Tewkesbury, UK via Plymouth, UK.
Posts: 1,259
Default

Thanks for the replies guys. I have been thinking about going over to LiPo but the only problem is that I race 1/12th, so the voltage is too high. I have been looking on the 'future of 12th scale' thread and it seems that if you want to run LiPo in 12th, there's a whole bunch of other things you need to change to support them. We'll see, I guess. Any advice on chargers/balancers please? What's hot/not? Thanks guys.
wingman2 is offline   Reply With Quote
Old 12-17-2008, 04:57 PM   #13
Tech Elite
 
edseb's Avatar
 
Join Date: Jan 2004
Location: Laguna Niguel, California
Posts: 2,421
Default

If you go Orion/Kokam you will not need to balance them very often. Even if you club race at least once a week, you will only need to balance them every 6 months. Now if you go with less stable packs, you will need to balance a lot more often. Something to consider when making your initial purchase.
__________________
RC Car Action Editor and Photographer
Carl Hyndman
edseb is offline   Reply With Quote
Old 12-17-2008, 05:42 PM   #14
mok
Tech Master
 
mok's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jul 2007
Location: Perth, Australia
Posts: 1,075
Trader Rating: 9 (100%+)
Send a message via MSN to mok Send a message via Skype™ to mok
Default

Quote:
Originally Posted by wingman2 View Post
Thanks for the replies guys. I have been thinking about going over to LiPo but the only problem is that I race 1/12th, so the voltage is too high. I have been looking on the 'future of 12th scale' thread and it seems that if you want to run LiPo in 12th, there's a whole bunch of other things you need to change to support them. We'll see, I guess. Any advice on chargers/balancers please? What's hot/not? Thanks guys.
There are a bunch of chargers that are all OEM-ed from the manufacturer, all with the exact same features and basic design/appearance.

GT Power V5
GT Power V6
Imax B5
Imax B6
Hot Power H6
..

There are many more with names in the format "xxxxx x5" or "xxxxx x6".
IMHO, these chargers represent a cheap and reliable charging solution, with correctly balanced cells.
(some of the cheap chargers do not even though claiming to be balanced!!)

I have 2 of these and find them to be quite functional...
http://rc-mushroom.com/product_info....ducts_id=15397

-Mark
__________________
XRAY T3'2011 / TEKIN RS PRO / LRP X12 / HYPERION SWIFT G3 RACE PACKS / FUTABA S9551 / SPEKTRUM DX3R
www.epracer.com - www.precc.org.au - www.westcoastmodelrallyclub.asn.au - www.onroadrccarclubbunbury.org.au
mok is offline   Reply With Quote
Old 12-17-2008, 06:00 PM   #15
Tech Champion
 
CraigM's Avatar
 
Join Date: Mar 2007
Location: Sydney, Australia
Posts: 7,009
Trader Rating: 34 (100%+)
Default

Quote:
Originally Posted by wingman2 View Post
Thanks for the replies guys. I have been thinking about going over to LiPo but the only problem is that I race 1/12th, so the voltage is too high. I have been looking on the 'future of 12th scale' thread and it seems that if you want to run LiPo in 12th, there's a whole bunch of other things you need to change to support them. We'll see, I guess. Any advice on chargers/balancers please? What's hot/not? Thanks guys.
stick with nimh until 12th scale decides what its doing. It'll most likely go 3.7v lipo, so you'll need an rx pack to power the electrics and a lower wind motor if you want to maintain the same lap times. There's currently only 1 hardcase 12th scale lipo on the market at the moment, you can read all about it below

http://www.rctech.net/forum/electric...case-pack.html
__________________
www.facebook.com/mcpheerc
CraigM is offline   Reply With Quote
Reply



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 10:30 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