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11-25-2016, 05:36 PM
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#1
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Senior Member
Join Date: Mar 2014
Location: Western Kentucky
Posts: 311
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Can I charge a lawn mower battery?
I was just curious - can I disconnect my battery, and plug in another 12v battery and charge it? I do need to charge a 12v lawn mower battery that I use for other applications - like blowing up an air mattress when the grandkids are staying.
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2014 Coachmen Catalina
243RBS 50th Anniversary
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11-25-2016, 05:40 PM
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#2
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Senior Member
Join Date: Sep 2013
Location: Idaho
Posts: 9,839
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I see no reason why not.
A cheap battery charger?
Cost you a Jackson at Sears.com
https://www.googleadservices.com/pag...uxcIwgE&adurl=
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11-25-2016, 05:48 PM
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#3
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Senior Member
Join Date: Feb 2014
Location: Ontario
Posts: 1,177
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All depends where you are going to swap the batteries , either in the tow veh or the trailer. In the trailer, no problem, in the truck you are going to have a hard time to start the truck to get it to charge with a dead lawn mower battery in it. As ford said go get a cheap battery charger and save a lot of hassle.
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2016 Nissan Pathfinder SL
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11-25-2016, 06:44 PM
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#4
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Mod free 5er
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,702
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Should be able to just hook up a 12v + & - to the lawn mower battery without unhooking the rv battery and get it charged.
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11-25-2016, 07:00 PM
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#5
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Cyber Phrenologist
Join Date: Jun 2007
Location: Southern Crescent
Posts: 1,806
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A few minutes charging from a vehicle with jumper cables would be the easiest, IMHO.
As stated any cheap charger will charge a lawn mower battery. They can be charged, after all, the mower charges the battery as it goes along.
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KU4OJ
2008 (or is it 2009?) Rockwood 8280SS - 2022 F-250 7.3L
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11-25-2016, 07:16 PM
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#6
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Senior Member
Join Date: Mar 2014
Location: Mountain Foothills of Southern Alberta
Posts: 2,005
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Small batteries like a low amp charge between 2 amps to 6 amps (max). I would buy a cheap low amp charger to do the job.
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11-26-2016, 03:41 AM
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#7
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Senior Member
Join Date: Mar 2014
Location: Western Kentucky
Posts: 311
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Thanks all - I believe I'll go to Wal-Mart!
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2014 Coachmen Catalina
243RBS 50th Anniversary
2013 F250 Lariat 6.7 Powerstroke
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11-26-2016, 03:06 PM
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#8
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Recently new!
Join Date: Dec 2014
Location: Arizona, in The Land of Scorch!
Posts: 1,206
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Charrrrge ittttt
Same as Old Coot. Just use some jumpers or clip leads and leave it like that for a while. Just remember, - to -, + to +..... Otherwise watch the sparks fly! 
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11-26-2016, 04:03 PM
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#9
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Senior Member
Join Date: Mar 2014
Location: Mountain Foothills of Southern Alberta
Posts: 2,005
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Not a good idea. If your lawnmower battery is dead you could destroy it with the excessive amperage from the RV/vehicle battery. That is why there are different amperage settings on battery chargers.
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2007 Surveyor SV230 - 200 Watts Solar/MPPT Controller - 220 AH Battery Bank (Two-GC2) - 600 watt PSW Inverter - (2) 2000 watt Inverter Generators - LED Lighting
2009 F150 - 5.4 Litre with Tow Package
Boon Docking 99% of the time.
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11-26-2016, 04:12 PM
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#10
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Senior Member
Join Date: Feb 2015
Posts: 426
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Be careful at Wal-Mart. They have a lawnmower battery there that has ZERO warranty. If you buy it and get homeland does not work, they wont replace it.
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11-26-2016, 04:35 PM
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#11
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Senior Member
Join Date: Sep 2013
Location: Idaho
Posts: 9,839
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Quote:
Originally Posted by sfsgm
Be careful at Wal-Mart. They have a lawnmower battery there that has ZERO warranty. If you buy it and get homeland does not work, they wont replace it.
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Understatement of the century!
/ 
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2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." 2014 19 days camping 2015 17 days camping201620 days camping
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11-26-2016, 04:53 PM
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#12
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Site Team
Join Date: Oct 2014
Posts: 15,301
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You should not charge ( or discharge) batteries of significantly different capacity, age or condition in parallel. You can damage one or both.
Get something like this: https://www.amazon.com/Schumacher-SE...attery+charger
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11-26-2016, 05:32 PM
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#13
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larryandamy
Join Date: Apr 2016
Location: Escondido, CA
Posts: 143
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Can I charge a lawn mower battery?
Yes you can... There is no technical reason as long as they are 12VDC batteries.
BUT seams like a hassle to me.
You could use jumper cables and you do not have to unhook your house battery.
But a better solution is just buying a charger. I like the smart low current chargers like they sell at Costco for $39, but it is now on sale for $29.
These take a long time to charge but they will never "toast" a battery with overcharging. See link below:
Battery Tender Power Plus 3 Amp Charger
These are microprocessor controlled and can be hooked up continuously... for months and it actually extends the life of your battery by cycling them to optimize battery life. I leave one on my boat batteries whenever the boat is not in use... which is about 360 days a year.
The only negative to this type of charger is if you are in a hurry. Charging your lawn mower battery could take several hours (2 to 4).
Then you want an 8 to 10 amp charger. But most of these will over charge if you leave them hooked up over night or longer. Over charging boils out battery fluid (water/acid) and will shorten life of GSM or gell batteries if you leave them on too long.
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11-26-2016, 07:09 PM
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#14
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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Quote:
Originally Posted by sfsgm
Be careful at Wal-Mart. They have a lawnmower battery there that has ZERO warranty. If you buy it and get homeland does not work, they wont replace it.
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I think he was going to Walmart for the charger. He seems to already have the battery.
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11-26-2016, 09:01 PM
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#15
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,149
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Quote:
Originally Posted by sfsgm
Be careful at Wal-Mart. They have a lawnmower battery there that has ZERO warranty. If you buy it and get homeland does not work, they wont replace it.
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I just checked at our local Walmart and all lawn and garden batteries have at least a 90 day warranty, even the $19.99 model. Not sure what you were referring to? Even checked Walmart.com and don't see anything listed without a 90 day warranty.
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11-26-2016, 09:48 PM
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#16
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Senior Member
Join Date: Jan 2015
Posts: 309
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Sad, when people hating on
Wal-Mart. Shedding a tear in Kansas City, MO!
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Chip Bruce, RPh
Kansas City, MO
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11-27-2016, 10:00 AM
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#17
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Recently new!
Join Date: Dec 2014
Location: Arizona, in The Land of Scorch!
Posts: 1,206
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Charrrrge tttt
Yes, you can charge across with another battery with the method I described. By using clip leads, or any small gauge jumper wires (18 ga or smaller), and keeping an eye on timing and voltage. The small wire will be self limiting on current. Voltage will have to be checked after the battery is disconnected a few hours and with a moderate load. I have just let it charge for 4 to 6 hours, and am usually good.
I will agree, the best way is to get a small charger, or place a regular charger onto the 2 amp or trickle charge setting for small batteries for a day or so. If you are going to buy a charger, then get a battery minder, smart charger, or the like. That way, it can be used for charging the smaller battery, and when you put your rig or car in storage.
__________________
1987 Starcraft Nova tent trailer, purch. '87, sold 8.14
2013 Crusader 290RLT bought new, 8.14 lotsa mods!
2001 Ford F-250 7.3
Loving wife, R.I.P., 6/6/19
and Mason the always dirty dog! R.I.P, 2/19
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