Homemade Battery Tender - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Electrical
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 02-26-2005, 12:49 PM
MI2600's Avatar
Member# 3287
 

Last journal entry: Vortec Heads
Last photo:
Join Date: Jul 2002
Location: N. Muskegon, MI
Posts: 2,632
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Homemade Battery Tender

There was a recent electrical thread that had a post containing info on making a homemade battery tender. I've searched all over w/o success.

Anyone know where it's at?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 03-01-2005, 09:00 AM
willys36@aol.com's Avatar
Hotrodders.com Moderator
 
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto...
Last journal entry: How to change auto shift timing on 200R4
Last photo:
Join Date: May 2002
Location: Bakersfield
Posts: 8,393
Wiki Edits: 21

Thanks: 1
Thanked 8 Times in 8 Posts
I am the first to head to DIY but trickle chargers (I assume this is what you mean by a 'battery tender') are so cheap why fool with DIY?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 03-01-2005, 09:04 AM
willys36@aol.com's Avatar
Hotrodders.com Moderator
 
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto...
Last journal entry: How to change auto shift timing on 200R4
Last photo:
Join Date: May 2002
Location: Bakersfield
Posts: 8,393
Wiki Edits: 21

Thanks: 1
Thanked 8 Times in 8 Posts
Double post!
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 03-03-2005, 08:31 AM
MI2600's Avatar
Member# 3287
 

Last journal entry: Vortec Heads
Last photo:
Join Date: Jul 2002
Location: N. Muskegon, MI
Posts: 2,632
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
This idea used one of those small chargers for tape recorders or whatever and I happened to have one (or three). Then, all that was needed was some alligator clips.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 03-03-2005, 10:41 AM
daimon1054's Avatar
Member
 
Join Date: Oct 2003
Location: Louisiana
Posts: 496
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
willys the battery tender uses a small chip to only send charge to the bat when needed. The trickle charger always sends current and even though it is a small amount over time can damage the battery. I don't think you are going to make the battery tender in the garage a trickle charger sure, if you have 12 volt radio power supply then all you need to do is either clip it to the bat or make a cig lighter plug and stick it in there.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 03-03-2005, 11:04 AM
302 Z28's Avatar  
Last photo:
Join Date: May 2003
Location: North Texas
Posts: 10,839
Wiki Edits: 0

Thanks: 1
Thanked 86 Times in 73 Posts
There is a battery mangement system with the brand name "Battery Tender". I have several, including two Battery Tender Jr. models. A 12v wet cell battery needs a constant charge in order to be up to it's potential. The Battery Tender line charge a 12v wet cell to a predetermined voltage, sense the voltage fall off at full charge and automatically switch to a "float" charge. The float charge is not a trickle charge, it is a constanty variable reduced charge rate designed to maintain a specific voltage in the battery. A constant charger, be it trickle or float WILL NOT damage a battery if the chrager is engineered correctly. I have had a Battery Tender Jr. on my generator for over 5 years. It sits up sometimes for 8 months before I remember to run it. It has never failed to turn over and start.

http://www.batterytender.com/default.php?cPath=11_3&osCsid=be75017ae20b5316a8a6 4f297ecd2b2e

Vince
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 03-03-2005, 12:42 PM
willys36@aol.com's Avatar
Hotrodders.com Moderator
 
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto...
Last journal entry: How to change auto shift timing on 200R4
Last photo:
Join Date: May 2002
Location: Bakersfield
Posts: 8,393
Wiki Edits: 21

Thanks: 1
Thanked 8 Times in 8 Posts
Quote:
Originally Posted by daimon1054
willys the battery tender uses a small chip to only send charge to the bat when needed. The trickle charger always sends current and even though it is a small amount over time can damage the battery. I don't think you are going to make the battery tender in the garage a trickle charger sure, if you have 12 volt radio power supply then all you need to do is either clip it to the bat or make a cig lighter plug and stick it in there.
Hmmm . . . . Here are the specs or the charger/tender I referenced above on the ebayY auction,

Suitable for 12 Volt wet-lead-acid,
Sealed-lead, gel, and absorbed mat
Batteries.

One LED turns Yellow, and Green to
Indicate charging status.

Automatic cut-off and then true float to maintain a full charge indefinitely
Without harming the battery.

Electromagnetic interference (EMI) is
Controlled; TV, Radio, and other
Appliances are not affected


Also my experience is that most good quality commercial battery chargers taper and shut off as battery comes up to speed. For example I have a medium grade trickle/10amp/50amp charger at home that modulates the current based on battery voltage and turns completely off when fully charged so does no harm.

If you are doing any hot rodding/car building at all I recommend you get a charger similar to mine w/ +10amp capability. Great for charging batteries for sure but is an invaluable 12V power supply to test electrical systems when a battery is not conveniently avaiable. For example, I am using mine currently to trouble-shoot my EZ wiring harness in my pickup project. I am still several months away from needing a battery and my charger is a great substitute for problem solving.

Incidentally, here is the thread you were looking for in your original post.

Last edited by willys36@aol.com; 03-03-2005 at 12:51 PM.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 03-06-2005, 01:08 AM
Member
 
Last wiki edit: Window removal and installation Last photo:
Join Date: Dec 2003
Location: SC
Age: 51
Posts: 275
Wiki Edits: 11

Thanks: 0
Thanked 6 Times in 6 Posts
Harbor Freight had 1 amp "battery tenders" on sale about 6 months ago. I bought two for $8 each. Both have been in continous service since, one on a motorcycle and one on various car batteries in the garage. I find it pretty hard to justify screwing around with light bulbs and Radio Shack parts to save $8 plus a couple of dollars shipping.
Reply With Quote Quick reply to this message

Recent Electrical posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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 On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need help please with an electrical headake bowtieorbust Electrical 15 01-26-2006 04:01 PM
Charging system info............... poncho62 Electrical 11 11-26-2005 09:53 PM
Battery problem? evltwin Electrical 11 04-10-2005 07:45 PM
Battery Exploded! VWFan Electrical 14 12-05-2004 05:52 PM
starting issues...battery or starter? 79454 Engine 6 10-25-2003 05:10 PM


All times are GMT -6. The time now is 11:22 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.