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

charge two batteries with one charger

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

charge two batteries with one charger

Old 05-09-2007, 01:56 PM
  #1  
thatdecade
Junior Member
Thread Starter
 
Join Date: Jan 2005
Location: LC, WI
Posts: 7
Likes: 0
Received 0 Likes on 0 Posts
Default charge two batteries with one charger

I have a pair of 9.6V 700 mAh NiCd batteries I would like to use. They run in parallel to a 5V regulator. This combo seems to work, but I'm worried about running the batteries too low and damaging the overall battery life.

The batteries came with a 12V 7W charger and was curious if I would be able to attach it to charge my batteries while they are still connected to everything else. Since the polarities on the charger and the battery are the same, I figure the regulator should be able to handle the now 12V input because the datasheet tells me a range of 8 to 12V.
So maybe I can charge both the batteries at the same times without disconnecting them from the circuits?

http://www.national.com/ds.cgi/LM/LM341.pdf
Old 05-10-2007, 09:26 AM
  #2  
pettit
My Feedback: (23)
 
pettit's Avatar
 
Join Date: Dec 2001
Location: Durham, NC
Posts: 2,769
Likes: 0
Received 1 Like on 1 Post
Default RE: charge two batteries with one charger

Nicads have to be charged separately, not in parallel.

One battery may have a slightly different internal resistance which changes the time it will take to charge. Most often, one battery will charge faster than the other.

One at a time, and no regulator. Charger directly to the battery.

Old 05-10-2007, 09:30 AM
  #3  
thatdecade
Junior Member
Thread Starter
 
Join Date: Jan 2005
Location: LC, WI
Posts: 7
Likes: 0
Received 0 Likes on 0 Posts
Default RE: charge two batteries with one charger

Thanks for the reply, one more question though.

If I only use one battery pack, do I still have to disconnect the battery from my circuit?

Edit:
I mean the charger will be connected directly to the battery, but the battery will still be connected to everything else.
Old 05-10-2007, 12:28 PM
  #4  
richrd
Senior Member
 
Join Date: Jul 2005
Location: Waterford, PA
Posts: 984
Likes: 0
Received 0 Likes on 0 Posts
Default RE: charge two batteries with one charger

The regulator may load to much an mess up the peak detection if using a fast charger. On slow charge I really can not think of a problem other than just being slower due to the regulator load. Just best to do seperate then nothing to worry about.
Rich

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 -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.