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

Charging a lawn tractor battery for the field box

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

Charging a lawn tractor battery for the field box

Old 04-02-2013, 12:13 PM
  #1  
coalburner
Junior Member
Thread Starter
My Feedback: (1)
 
Join Date: Nov 2012
Location: Needham, MA
Posts: 25
Likes: 0
Received 0 Likes on 0 Posts
Default Charging a lawn tractor battery for the field box

I have a Diehard lawn tractor battery that I use occasionally with my RC starters. I was wondering if I could trickle charge it with the wall wort type chargers that are normally used to overnight charge the regular size field box 12V batteries. I measured the voltage on the lawn battery and it reads a bit more than 12 volts, which I would assume to be a normal full charge, but I wanted to just take measures to keep it this way. My regular Diehard battery charger would just indicate that it is at full charge and does not take further action. What do you think? or should I leave things alone.
Old 04-02-2013, 12:30 PM
  #2  
4*60
My Feedback: (41)
 
Join Date: Mar 2002
Location: Shuswap, BC,
Posts: 1,752
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Charging a lawn tractor battery for the field box

State of Charge Voltage 12V 100% 12.7 75% 12.4 50% 12.2 25% 12.0 Discharged 11.9

So 12.6'ish is fully charged. I would just put it on charge with a regular charger every 2-3 weeks or every month. Shouldn't lose much standing during that time.
Old 04-02-2013, 10:30 PM
  #3  
Warjet
My Feedback: (327)
 
Join Date: Jan 2002
Location: El Cajon, CA
Posts: 329
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Charging a lawn tractor battery for the field box

I use a lawn tractor battery from Walmart that has 280 cc amps for everything except the 7 amp battery inside the field box to operate the power panel. Charge lasts a month at least, depending on how many times you charge the flight batteries, and it can be charged with your 5 - 10 amp field charger off the car battery. Costs $28 + core charge. Last one I had lasted about 2 years. The 240 cc amp version is $24.
Old 04-03-2013, 05:39 AM
  #4  
Zrock
Senior Member
 
Join Date: Oct 2012
Location: *, BC, CANADA
Posts: 123
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Charging a lawn tractor battery for the field box

Just get one of those cheep battery charger/maintainers from your local canadian tire or walmart. They can be had for $20 - $30. Bolt it to the battery and make it part of your field box get home plug it in and forget it. Then you never have to worry about "is my battery going to last me the day?"
Old 04-03-2013, 06:46 AM
  #5  
Rodney
Senior Member
 
Join Date: Dec 2001
Location: FL
Posts: 7,769
Likes: 0
Received 4 Likes on 4 Posts
Default RE: Charging a lawn tractor battery for the field box


ORIGINAL: 4*60

State of Charge Voltage 12V 100% 12.7 75% 12.4 50% 12.2 25% 12.0 Discharged 11.9

So 12.6'ish is fully charged. I would just put it on charge with a regular charger every 2-3 weeks or every month. Shouldn't lose much standing during that time.
I believe you are slightly in error here, full charge on a Pb wet cell under normal temperature is 13.7 volts.
Old 04-03-2013, 07:00 AM
  #6  
flyinwalenda
My Feedback: (5)
 
flyinwalenda's Avatar
 
Join Date: Oct 2009
Location: Northeast, PA
Posts: 3,975
Likes: 0
Received 1 Like on 1 Post
Default RE: Charging a lawn tractor battery for the field box

Get a 12volt voltwatch ,stick it to the case and wire it onto the battery terminals. Press the button and you will know how the battery is doing. When it gets to the red then put the Diehard charger on it !

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXDXG9
Old 04-03-2013, 01:51 PM
  #7  
4*60
My Feedback: (41)
 
Join Date: Mar 2002
Location: Shuswap, BC,
Posts: 1,752
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Charging a lawn tractor battery for the field box


ORIGINAL: Rodney


ORIGINAL: 4*60

State of Charge Voltage 12V 100% 12.7 75% 12.4 50% 12.2 25% 12.0 Discharged 11.9

So 12.6'ish is fully charged. I would just put it on charge with a regular charger every 2-3 weeks or every month. Shouldn't lose much standing during that time.
I believe you are slightly in error here, full charge on a Pb wet cell under normal temperature is 13.7 volts.
Doesn't matter what you believe!!

12.7 at rest is fully charged. Here is 24 volt example.

http://www.solar-facts.com/batteries...y-charging.php

AND

http://centurionenergy.net/lead-acid-battery-basics



quote:
A fully charged lead acid battery will be at 12.6v at 70ᵒ F, this is the sitting open circuit voltage, meaning that it has not been charged or had a load in at least several hours

Old 04-04-2013, 02:35 PM
  #8  
Rodney
Senior Member
 
Join Date: Dec 2001
Location: FL
Posts: 7,769
Likes: 0
Received 4 Likes on 4 Posts
Default RE: Charging a lawn tractor battery for the field box

Sorry 4*60, you are wrong. I've worked with these batteries for many years and the 13.7 volts is the proper number. You might want to check with an expert, Red at Hangtime hobbies for further info. www.hangtime.com/redsbatteryclinic/html or check with some of the ARRL info as HAMs used to use lots of these Pb cells and have published several articles on chargers for them and what voltage levels you can expect to see.
Old 04-04-2013, 02:59 PM
  #9  
hugger-4641
My Feedback: (6)
 
hugger-4641's Avatar
 
Join Date: Oct 2008
Location: McKenzie, TN
Posts: 1,886
Received 0 Likes on 0 Posts
Default RE: Charging a lawn tractor battery for the field box

Rodney is correct, I might add that most car alternators now days put out about 14.2 volts to accomodate a full charge.
Old 04-05-2013, 11:08 PM
  #10  
chuckk2
Senior Member
 
Join Date: Jul 2007
Location: Warner Robins, GA
Posts: 1,247
Likes: 0
Received 4 Likes on 4 Posts
Default RE: Charging a lawn tractor battery for the field box

Looking at one of the Pb batteries I have
13.6-13.8 is the specified "float charge" voltage, and 14.6-8 the maximum charge voltage.
Old 04-05-2013, 11:54 PM
  #11  
snuts
Senior Member
 
Join Date: Dec 2008
Location: camrose alberta, AB, CANADA
Posts: 514
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Charging a lawn tractor battery for the field box

Well going back to the original Question. I simply build a patch cord that goes from the Cigirrette lighter in my minivan to the back. Then attach my battery to it, charge on the way to the field occasionally.
Hope this helps
-Snuts-
Old 04-06-2013, 08:51 AM
  #12  
Truckracer
My Feedback: (19)
 
Join Date: Apr 2004
Location: Des Moines, IA
Posts: 5,256
Received 37 Likes on 37 Posts
Default RE: Charging a lawn tractor battery for the field box

Rodney and 4*60 are not listening to each other! I'll leave it at this: there is a difference between resting voltage (not on a charger and having sat for awhile) and on charge voltage.
Old 04-06-2013, 09:32 AM
  #13  
wcmorrison
My Feedback: (2)
 
Join Date: Oct 2002
Location: Weatherford, TX
Posts: 1,379
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Charging a lawn tractor battery for the field box

Long time ago I bought a "Keep warm" charger from Walmart.  It was designed to hook up to car batteries in the northern tier states while installed in the car.  It basically is a one amp float charger.  But on the cold mornings it kept the battery warm and functional.  Had a short cord to run out the grill for hook ups in your garage or at the motel (yes they have outlets just for that and heating the block too).  At anyrate that charger keeps my lawn tractor battery up that I use for starting and some times via the 12 V charger my airplane batteries.  My 5 year old lawn tractor battery spins my started like a top.
Old 04-06-2013, 11:57 AM
  #14  
pilotpete2
 
pilotpete2's Avatar
 
Join Date: Oct 2002
Location: Lyndonville, VT
Posts: 3,305
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Charging a lawn tractor battery for the field box

+1!
I have two of the Schummacher 1.5A 6/12V battery maintainers from Wally World. Perfect for keeping the flight box battery topped off during the flying season. During the winter, my ATV (aircraft transportation vehicle) gets very little road time, so I keep it on float charge, ditto for the garden tractor/mower battery.
At 20 bucks, these are a good investment!
While these units are rated at 1.5A charge rate, I've found that when hooked to a 7Ahr gel cell field box battery after a day at the flying field, they actually only hit about .5A, so no problem with the charge rate for our field box batteries[8D]
Pete
Old 04-07-2013, 12:26 PM
  #15  
hookedonrc
 
hookedonrc's Avatar
 
Join Date: Dec 2002
Location: Tulsa, OK
Posts: 2,890
Likes: 0
Received 1 Like on 1 Post
Default RE: Charging a lawn tractor battery for the field box

I use a "Battery Tender" only $20 and works great. I used to use it on my old lawn tractor and then a scooter during the Winter months. It works great and doesn't cost a mint.

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 or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.