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06-24-2016, 05:15 PM
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#1
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Senior Member
Join Date: Apr 2016
Location: eastcupcake
Posts: 274
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Charging /w Battery Tender
I have 2 deep cycle batteries in series on the RV.
Would like to be able to charge them both.
I have a Battery Tender Trickle Charger seen below.
If I attach this to one battery that is in series will it also charge the other one as well??? 
Thank in advance for any help.
Rhody
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06-24-2016, 05:21 PM
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#2
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Site Team
Join Date: Oct 2014
Posts: 15,300
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If you have two batteries in parallel ( positive to positive & Negative to negative) then yes. If they are really in series ( positive to negative )then no. Are the batteries 6V or 12V? If they are 12V they are most likely in parallel. If they are 6V then they are in series.
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06-24-2016, 05:34 PM
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#3
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Senior Member
Join Date: Apr 2016
Location: eastcupcake
Posts: 274
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Quote:
Originally Posted by Flybob
If you have two batteries in parallel ( positive to positive & Negative to negative) then yes. If they are really in series ( positive to negative )then no. Are the batteries 6V or 12V? If they are 12V they are most likely in parallel. If they are 6V then they are in series.
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Ok so I was incorrect, they are in wired in parallel.
Pos to Pos Neg to Neg.
So if I put the Battery Tender on one battery it will charge both?
Thank you for the speedy reply!
Rhody
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06-24-2016, 05:38 PM
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#4
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Senior Member
Join Date: Sep 2015
Posts: 3,464
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Yup
2016 Sabre 36QBOK
2015 Ram 3500 CUMMINS
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2017 Dynamax Isata 4
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06-24-2016, 05:57 PM
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#5
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Senior Member
Join Date: Jun 2013
Location: Brazoria County, Texas
Posts: 1,460
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Depending on the amount of battery you have, you may not be happy with it. I bought one last year when I went to 6V's. That 1.25A charger wouldn't fully float them. I ended up giving the battery tender away and buying another CTEK.
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2015 Chevy Silverado LTZ - HD tow package
2017 Rockwood 2703WS Emerald Edition
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06-24-2016, 07:09 PM
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#6
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Senior Member
Join Date: Apr 2016
Location: eastcupcake
Posts: 274
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Quote:
Originally Posted by raspivey
Depending on the amount of battery you have, you may not be happy with it. I bought one last year when I went to 6V's. That 1.25A charger wouldn't fully float them. I ended up giving the battery tender away and buying another CTEK.
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Lol
Thanks I think I will be fine. 
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06-25-2016, 12:56 PM
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#7
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Senior Member
Join Date: Jun 2016
Location: Maurice, LA
Posts: 4,095
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Quote:
Originally Posted by Rhody
Ok so I was incorrect, they are in wired in parallel.
Pos to Pos Neg to Neg.
So if I put the Battery Tender on one battery it will charge both?
Thank you for the speedy reply!
Rhody
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DO NOT make light of the fact that you were incorrect. If in fact you hook them up in series you will have 24 volts coming out of two 12 volt batteries and most likely burn up your electronics and or create a fire which will burn your camper.
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06-25-2016, 12:59 PM
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#8
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Senior Member
Join Date: Feb 2014
Posts: 2,832
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Quote:
Originally Posted by Rhody
Lol
Thanks I think I will be fine. |
If you are looking to CHARGE rather than maintain....the Tender is not suitable. You need a minimum of a 10% of amp hours charger to do actual charging and it should provide 14.5V during bulk charging to mix your fluid preventing stratification and sulphation. You have a MINIMUM of 150 amp hours in a pair of 12Volts...so you need a smart charger of a minimum 15 amps...with 30 a much better choice.
Tenders tend...Chargers charge!
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Cam
2015 Georgetown 280DS
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06-25-2016, 01:04 PM
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#9
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Senior Member
Join Date: Apr 2016
Location: eastcupcake
Posts: 274
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Quote:
Originally Posted by DouglasReid
DO NOT make light of the fact that you were incorrect. If in fact you hook them up in series you will have 24 volts coming out of two 12 volt batteries and most likely burn up your electronics and or create a fire which will burn your camper.
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LOL
I I Captain...
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06-25-2016, 01:06 PM
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#10
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Senior Member
Join Date: Apr 2016
Location: eastcupcake
Posts: 274
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Quote:
Originally Posted by camaraderie
If you are looking to CHARGE rather than maintain....the Tender is not suitable. You need a minimum of a 10% of amp hours charger to do actual charging and it should provide 14.5V during bulk charging to mix your fluid preventing stratification and sulphation. You have a MINIMUM of 150 amp hours in a pair of 12Volts...so you need a smart charger of a minimum 15 amps...with 30 a much better choice.
Tenders tend...Chargers charge!
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Brand New 1000 amp Gell Cells!
Tending Only!
Thank you!
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06-25-2016, 03:28 PM
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#11
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Senior Member
Join Date: Jan 2015
Location: S Florida
Posts: 294
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I got a battery tender hooked to my boat 24/7. Keeps batteries topped off even when bilge runs on occasion.
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06-25-2016, 06:03 PM
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#12
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Senior Member
Join Date: Apr 2016
Location: eastcupcake
Posts: 274
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Quote:
Originally Posted by mudman2
I got a battery tender hooked to my boat 24/7. Keeps batteries topped off even when bilge runs on occasion.
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BINGO! 
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06-25-2016, 07:12 PM
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#13
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Senior Member
Join Date: Mar 2014
Posts: 939
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I burned a battery tender just about like that one only a little smaller trying to charge 2 12 volt in parallel it's just too much load for them
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Rockwood 2104S, 2014 Ram 2500 Diesel.
USMC 68 -70
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06-25-2016, 07:46 PM
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#14
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Senior Member
Join Date: Jan 2015
Location: S Florida
Posts: 294
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Quote:
Originally Posted by Too Tall
I burned a battery tender just about like that one only a little smaller trying to charge 2 12 volt in parallel it's just too much load for them
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I may be wrong but the tender is just that a tender. Not a charger. I believe ur batteries have to be charged for the tender to maintain charge.
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06-25-2016, 07:54 PM
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#15
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Senior Member
Join Date: Apr 2016
Location: eastcupcake
Posts: 274
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Quote:
Originally Posted by Too Tall
I burned a battery tender just about like that one only a little smaller trying to charge 2 12 volt in parallel it's just too much load for them
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lol thanks so much!
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06-25-2016, 08:00 PM
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#16
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Senior Member
Join Date: May 2014
Posts: 126
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Quote:
Originally Posted by Rhody
I have 2 deep cycle batteries in series on the RV.
Would like to be able to charge them both.
I have a Battery Tender Trickle Charger seen below.
If I attach this to one battery that is in series will it also charge the other one as well???
Thank in advance for any help.
Rhody |
yes it will work.....that's exactly how i charge/maintain my 2 12 volt batteries
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06-25-2016, 08:02 PM
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#17
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Member
Join Date: Jun 2015
Location: Florida
Posts: 63
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I've used one for four years on my home generator and it's still maintaining, goes red for 2 minutes when fires up then goes green. Cheaper than $400 trickle charger from manufacturer.
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2015 PRIME TIME AVENGER 28 DBS
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06-25-2016, 08:17 PM
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#18
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Senior Member
Join Date: Apr 2016
Location: eastcupcake
Posts: 274
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Quote:
Originally Posted by Powerman
I've used one for four years on my home generator and it's still maintaining, goes red for 2 minutes when fires up then goes green. Cheaper than $400 trickle charger from manufacturer.
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Bingo! Thanks
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06-25-2016, 08:48 PM
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#19
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Jack of All Trades
Join Date: Oct 2010
Location: Williston, Florida
Posts: 317
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Confused
Why not use your built-in converter?
Most new trailers have a three or four-stage smart converter that will take good care of charging and maintaining a battery.
Rick
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06-25-2016, 10:34 PM
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#20
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Senior Member
Join Date: Mar 2014
Posts: 939
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Quote:
Originally Posted by mudman2
I may be wrong but the tender is just that a tender. Not a charger. I believe ur batteries have to be charged for the tender to maintain charge.
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Yeah, it might have been a fluke but I think the little tender was just running at it's max with 2 group 27 batteries in parallel. I probably should have unplugged it in hindsight as it was very hot.
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Rockwood 2104S, 2014 Ram 2500 Diesel.
USMC 68 -70
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