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Old 07-21-2017, 08:03 PM   #1
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Hose Battery Replacement

I am looking to replace the cheap house batteries on my 2015 MiraMar 34.2 Thinking of Group 34 AGM ? Any advice ?

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Old 07-28-2017, 07:21 AM   #2
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I am looking to replace the cheap house batteries on my 2015 MiraMar 34.2 Thinking of Group 34 AGM ? Any advice ?


Try looking at Vmax AGM 6v batteries. Just a suggestion.
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Old 07-28-2017, 10:52 AM   #3
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You may need a different charger for AGM batteries, I believe they require a different charging rate.
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Old 07-28-2017, 11:12 AM   #4
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You may need a different charger for AGM batteries, I believe they require a different charging rate.
No special charger for AGM batteries, they use the same lead-acid chemistry.
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Old 07-28-2017, 11:26 AM   #5
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As with all gelled and sealed units, AGM batteries are sensitive to overcharging. A charge to 2.40V/cell (and higher) is fine; however, the float charge should be reduced to between 2.25 and 2.30V/cell (summer temperatures may require lower voltages). Automotive charging systems for flooded lead acid often have a fixed float voltage setting of 14.40V (2.40V/cell); a direct replacement with a sealed unit could overcharge the battery on a long drive.

Found this. I would do some checking on what type of charger you have and make sure it's ok. I would hate to see you buy expensive batteries and then ruin them. Hopefully someone with AGM experience will chime in.
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Old 07-28-2017, 12:20 PM   #6
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As with all gelled and sealed units, AGM batteries are sensitive to overcharging. A charge to 2.40V/cell (and higher) is fine; however, the float charge should be reduced to between 2.25 and 2.30V/cell (summer temperatures may require lower voltages). Automotive charging systems for flooded lead acid often have a fixed float voltage setting of 14.40V (2.40V/cell); a direct replacement with a sealed unit could overcharge the battery on a long drive.

Found this. I would do some checking on what type of charger you have and make sure it's ok. I would hate to see you buy expensive batteries and then ruin them. Hopefully someone with AGM experience will chime in.
Key words "could" and "long drive" talking about charging from an automotive alternator and regulator, not from a MH converter that kicks the voltage down to 13.1 volts when fully charged.
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Old 07-28-2017, 04:44 PM   #7
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Thanks to everyone for the replies, I will do some research into charging AGM Batteries
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Old 07-28-2017, 09:40 PM   #8
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Battery water

Do you really need to use distilled water in your batteries? If so where do you get it?
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Old 07-28-2017, 09:42 PM   #9
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Do you really need to use distilled water in your batteries? If so where do you get it?


WalMart caries distilled water by the gallon, in the grocery water area
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Old 07-28-2017, 09:45 PM   #10
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Thanks I'll get some.
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Old 07-28-2017, 10:59 PM   #11
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Distilled water - absolutely. Distilled should also be used in the radiator.
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Old 07-29-2017, 12:45 AM   #12
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Tap water contains minerals which will destroy a battery quickly. Use only distilled water in lead acid batteries.
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Old 07-29-2017, 01:21 AM   #13
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For those in the north with basements and dehumidifiers - catch a tankful of water from that... An seemingly endless supply of distilled water if you have a normally damp basement.
Now in FL - no more basement - will be buying it for the first time... lol
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Old 07-29-2017, 02:18 AM   #14
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For those in the north with basements and dehumidifiers - catch a tankful of water from that... An seemingly endless supply of distilled water if you have a normally damp basement.
Now in FL - no more basement - will be buying it for the first time... lol
In Florida you get it from your A/C which runs continually.
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