Fun, Learning, Friendship and Mutual Respect
START  HERE


Unregistered
Go Back   HeliFreak > R/C Batteries and Charging Support > LiIon, LiPo, NiCd & NiMh General


LiIon, LiPo, NiCd & NiMh General General Battery Support


Reply
 
Thread Tools Display Modes
Old 05-25-2011, 12:31 PM   #1
mborodave
Registered Users
 

Join Date: Mar 2011
Location: Murfreesboro, TN
Default POWER SUPPLY

Hello, Been flying my mSR & 120SR for a coulpe of months now. The chargers for them are fine. I recently got my 20 yr old rc-10 car up and running that uses 6s 7.2v nicad packs. I bought 3 nimh packs and they are working great. The charger I have for it is also 20 yrs old. Ultimately I'm wanting to get into larger helis that require larger packs similar to the one for the rc-10.

When I am looking at new chargers to handle these 6s packs, is it suitable to use a battery charger for a car. The one I have is 12v and varies in amps up to 50 (pushing up to 600 watts). These chargers are fairly inexpensive compared to some of the others I've seen (around $40 or less).

Any reason these power supplies are seemingly overlooked??

Thanks,
- Dave
mborodave is offline        Reply With Quote
Old 05-25-2011, 10:40 PM   #2
desertstalker
Registered Users
 

Join Date: Apr 2011
Location: Australia
Default

Quote:
Originally Posted by mborodave View Post
Any reason these power supplies are seemingly overlooked??
Are they Lithium chargers? RC helis all use some sort of lithium chemistry cells where some RC cars are still using NiCd/Nimh packs. The Ni based cells are too heavy to be good for aircraft.

The reason Li chargers are more expensive is the extra complexity and precision required when charging Li cells.
desertstalker is offline        Reply With Quote
Old 05-26-2011, 12:57 AM   #3
N4HHA
Registered Users
 
Posts: 745
 

Join Date: Jan 2011
Location: Orlando
Default

Or are you asking if one of the 12V auto chargers will power a LiPo charger? Short answer, no.
N4HHA is offline        Reply With Quote
Old 05-26-2011, 04:32 PM   #4
mborodave
Registered Users
Thread Starter Thread Starter
 

Join Date: Mar 2011
Location: Murfreesboro, TN
Default

I'm only looking to use a car battery charger as a power supply for a rc-grade charger for lipo's / nimh / nicd / etc..

Still would go though a icharger, or some equivalent, but would like to use a car charger as a power supply...

Is this a realistic expectation?
mborodave is offline        Reply With Quote
Old 05-27-2011, 08:37 AM   #5
N4HHA
Registered Users
 
Posts: 745
 

Join Date: Jan 2011
Location: Orlando
Default

Most newer automotive chargers will not output any voltage until a battery is connected. They then perform a brief test on the battery for state of charge and turn off the output several times when changing "stages". The older (or cheaper low current) chargers can output very nasty unregulated and unfiltered crap that almost doesn't pass for DC.
__________________
B120SR BSR HK450 FBL 450/Align 3G
mCP X Draganflyer Quad
DX7

N4HHA is offline        Reply With Quote
Old 05-29-2011, 10:45 AM   #6
Phreak Out
Registered Users
 
Posts: 1,588
 
My HF Map location
Join Date: Jun 2010
Location: 30127, NW of ATL
Default

Quote:
Originally Posted by N4HHA View Post
The older (or cheaper low current) chargers can output very nasty unregulated and unfiltered crap that almost doesn't pass for DC.
This might seem expensive, but you'll get ~12.5V of "clean" DC --> LINK

Eventually, if the need to upgrade (example: charge two six-cell packs simultaneously) and you'll have a higher quality charger that can be useful like this, then you simply add another power supply, run it in series and you'll have yourself 25V @ ~47 amps (PHOTO).
__________________
---|---
The best performance upgrade is practice
Do it safely, do it often, and enjoy it. AMA #20703

Phreak Out is offline        Reply With Quote
Reply




Unregistered
Go Back   HeliFreak > R/C Batteries and Charging Support > LiIon, LiPo, NiCd & NiMh General


LiIon, LiPo, NiCd & NiMh General General Battery Support

Thread Tools
Display Modes

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

Forum Jump


Copyright © 2004-2015 by RCGroups.com, LLC except where otherwise indicated. The HeliFreak.com logo is a trademark of RCGroups.com, LLC.