Go Back  RCU Forums > Radios, Batteries, Clubhouse and more > Batteries & Chargers
Reload this Page >

Dual A123 battey though diode voltage drop?

Notices
Batteries & Chargers Nicads, Nickel Metal Hydride, Lithium, LiPoly, Chargers, Cyclers, etc...

Dual A123 battey though diode voltage drop?

Old 10-16-2009, 04:59 PM
  #1  
Fulcrum2111
Thread Starter
 
Join Date: Apr 2007
Posts: 207
Received 1 Like on 1 Post
Default Dual A123 battey though diode voltage drop?

Hello, I am runnig dual A123 batteries (1100mah) with two switches through a diode battery share device (42% battery share) The voltage after the diode drops 0.3 volts, and the voltmagic says obviously that is low (6.6 before the diode and 6.3 after the diode). The peak low voltage seems fine, green blinking, so acceptable. The question is this a problem? Should I run the both packs in parallel without diode? What do you think.
Thanks
Old 10-16-2009, 07:35 PM
  #2  
rcairflr
Senior Member
My Feedback: (44)
 
Join Date: Sep 2004
Location: Wichita, KS
Posts: 1,095
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Dual A123 battey though diode voltage drop?

Get rid of the battery share device, just something else to go wrong. Run the 2 batteries in parallel
Old 10-16-2009, 08:19 PM
  #3  
nonstoprc
My Feedback: (90)
 
nonstoprc's Avatar
 
Join Date: Sep 2003
Location: Central, TX
Posts: 2,466
Likes: 0
Received 1 Like on 1 Post
Default RE: Dual A123 battey though diode voltage drop?

agree. The dual 1100 A123 configuration without a share device works for me since VPX 1100 came out. It is sad that they can not be found easily on market now.
Old 10-16-2009, 09:55 PM
  #4  
flatspinjim
My Feedback: (3)
 
Join Date: Jun 2005
Location: ft lupton, CO
Posts: 895
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Dual A123 battey though diode voltage drop?

+3 on getting rid of the batt share. The best part about the A123's is there is no need for a regulator or diode to drop the voltage.
2 batteries, 2 switches. Keep it simple
Old 10-17-2009, 01:34 AM
  #5  
freeair
Senior Member
 
Join Date: May 2008
Location: queensland, AUSTRALIA
Posts: 891
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Dual A123 battey though diode voltage drop?

yes exactly true as above. i was considering the use of a Diode to be fitted to my transmitter Lipo battery as many have done but what happens if the Diode fails , [ no contact = no power ]
Old 10-17-2009, 12:02 PM
  #6  
pilotpete2
 
pilotpete2's Avatar
 
Join Date: Oct 2002
Location: Lyndonville, VT
Posts: 3,305
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Dual A123 battey though diode voltage drop?

What are the chances that a forward biased diode, running at a fraction of its rated current and voltage will fail open??
Probably not much I've seen at least one person double up two in parallel just to be safe.
Pete

Old 10-17-2009, 12:47 PM
  #7  
Capt Lou
Senior Member
 
Join Date: Jan 2007
Location: Waretown, NJ NJ
Posts: 543
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Dual A123 battey though diode voltage drop?

Fulcrum:

The purpose of two separate battery packs with two separate switches is to provide back-up redundency if one pack should fail. Doesn't the battery share device cause a convergence that now circumvents the redundency back-up?
Old 10-17-2009, 05:04 PM
  #8  
Fulcrum2111
Thread Starter
 
Join Date: Apr 2007
Posts: 207
Received 1 Like on 1 Post
Default RE: Dual A123 battey though diode voltage drop?

Captain, I have tested the dual battery device and has dual input cables, two diodes and two output cables. It will power by both of the output cables with only one of the batteries, so its redundant.
After all, I have listened to your recommendation and removed the dual battery device, now voltmagic works as expected and the average and peak low voltage remain in a safe spot.
Thank you.

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.