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Old 04-02-2016, 09:32 PM   #11
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Originally Posted by boondocking View Post
IMO if you are going to spend $80-$90 on a 2 amp battery maintainer to use at home through the winter. Why not spend another $30-$40 and buy a 20-30 amp battery charger with engine start. Way more versatile.
A battery maintainer is a good option if your RV is in storage with access to power over the winter.
2 amp battery tenders are no where near $80-90. $23.30 for a Battery Tender from Amazon. Leaving the batteries on a charger is more likely to cause damage. A 2 amp maintainer will never hurt them.


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Old 04-02-2016, 10:24 PM   #12
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@ davel1971

2 amp Battery Tender $80 - check the link below.

Didn't say to leave it on all the time.

Originally Posted by boondocking View Post
Another alternative is buy a smart charger and once a month put it on the batteries for 24 hours.


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Old 04-02-2016, 10:45 PM   #13
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I swap my BatteryMINDer between my trailer battery and my tractor battery every few weeks over the winter.
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Old 04-02-2016, 10:51 PM   #14
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Again, Thanks to you all... I didn't want to start any arguments or hate and discontent.
I take all suggestions into consideration. I will hopefully be able to make an intelligent and informed decision with your help and input...
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Old 04-03-2016, 12:22 PM   #15
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I use the Optima Digital 400. Works on all 12v batteries. Standard, deep cycle, and fiberglass mat. Computer control conditions batteries, and won't overcharge.
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Old 04-03-2016, 02:20 PM   #16
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A good check on any of the tender minders is to check the voltage at the batteries after they have been on charge for a day. Voltage should not be above about 13.5 volts for long term charge. Some cheap units I have found charge over 14 volts and this can cause battery problems. A digital voltmeter is needed to see what is happening with batteries
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Old 04-03-2016, 02:25 PM   #17
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I have one of these I use to keep my dump trailer battery topped up.

Works well.
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Old 04-03-2016, 05:54 PM   #18
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After putting a FULL charge on your DUAL PURPOSE GROUP 24 75 amp hour sealed wet may simply DISCONNECT the negative wire in place in either the coach or the workbench and you will lose about 10% of your charge EACH MONTH at room temperature...15-20% in summer heat in the coach. Much less than 10% in the winter.
This means you can leave the batteries disconnected and uncharging...safest.... for at least 90 days without affecting your battery life cycles AND the subsequent bulk charge mode will be better for desulfation than a continuous 1 or 2 amp maintenance charge.
Alternative to physically removing the black can pop on a $7 battery terminal disconnect switch to make it easier.
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Old 04-03-2016, 11:57 PM   #19
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I'm too lazy to pull my batteries. I bought a cheap 2 stroke $89 generator from Harbor Freight and use an extension cord with 2 male plugs on it and plug it into an external socket (yes, I know it can be dangerous). I leave the generator under the camper and come out once a month, start it, do errands, and come back 6-8 hours later to disconnect the battery. This also forces me to check the camper for any leaks that may have occurred during the winter and check for any intrusion by mice or homeless folk-don't laugh but homeless people squatting in campers in storage is becoming a growing problem.

Your way is probably best.
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Old 04-04-2016, 08:38 AM   #20
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+1 On BatteryMinder 2012 for multiple batteries.

Note that Amazon has it a few bucks cheaper. And it you're Amazon Prime you get free 2 day S&H. And with the new Amazon Store Card, you get 5% back. We're somewhat out in the woods and it's cheaper for us to let UPS do most the driving.

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