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Old 03-14-2015, 09:18 PM   #1
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What battery to buy

hello, I will need to buy a new 12v battery for the upcoming season and was looking at Exide Edge FP-AGM24DP Flat Plate AGM Sealed Marine Battery it sells on Amazon for $175
anyone has any experience using this battery?

thank you.
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Old 03-14-2015, 09:38 PM   #2
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I'm having a Trojan AGM group 27 placed on a new 185RB Baja on order which I'll pick up later this year; figured if I was going to go to the expense of AGM I might as well get the group 27.

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Old 03-14-2015, 09:41 PM   #3
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what does group numbering mean?
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Old 03-14-2015, 09:46 PM   #4
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It's mainly the dimensions, which in turn affects capacity. Here's a quick chart:

List of Common Battery Case Sizes | BCI Group Numbers

The 2015 SLX manual says it's set up for a group 27, so although a 24 fits fine and is what most RV places put on there (as they're cheaper), the weight difference isn't much and the extra 10+% capacity is useful for me.
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Old 03-14-2015, 09:49 PM   #5
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ok, just googled it group is a physical size of the battery
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Old 03-14-2015, 09:51 PM   #6
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Quote:
Originally Posted by lennyl View Post
what does group numbering mean?
It is a relative size and capacity indication: A group 24 is physically smaller and has less capacity (amp hours) than a group 27.

There are group 27 Excide batteries. You could compare the size etc. to the group 24 you are considering.
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Old 03-14-2015, 09:52 PM   #7
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My post about the sizes etc had a link so it was held for moderation If it pops up randomly later, my bad.
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Old 03-15-2015, 06:21 AM   #8
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I have never had a positive experience with ANY Exide battery. If available I would use an Interstate - or any brand but Exide.
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Old 03-15-2015, 07:29 AM   #9
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Not sure but there is something special about charging the AGM battery. You may need to make sure your on board charger will accommodate the AGM battery. Always had good luck with Interstate batteries.
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Old 03-15-2015, 08:24 AM   #10
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Which battery do you need?

The first question you want to ask before buying the battery is what it will be used for. If you are only camping at CG's with shore power there is no reason for a group 27 battery, or a DEEP CYCLE battery, the BASIC group 24 that comes with the TT is all you need, as it sole purpose is for emergency breaking (TT's electric break away switch activated) and will absorb any spikes that may be produced by the TT's battery charge controller (from a shore power spike). The new TT battery control centers suppress the spikes now. With proper maintenance, the standard RV/Marine battery that is standard on TT's will last for years.

If you are looking at a lot of dry-camping then the recommendation would be TRUE DEEP CYCLE batteries (not RV/Marine batteries which have CCA ratings). 12 Volt DEEP CYCLE batteries have less Ah ratings than (2) 6VDC batteries in series, so you may want to look at (2) 6VDC batteries in series. IE.. my (2) 6 volt batteries are rated at 260Ah rating, of which I can only use 130Ah of the 260Ah (12VDC minimum voltage level - 50%)

As for Flooded batteries vs AGM there is plenty of debate as to whether the extra money is worth it for the AGM. If your batteries are in an enclosed area, than AGM would be a good choice.

There are plenty of manufactures out there that have both flooded and AGM product lines.

Trojan
USBattery
Interstate (not sure about True DEEP Cycle Batteries, did not see any listed)
and many more....

Space is a driving factor on TT's as they have limited room to place your batteries. If you are looking for a true DEEP CYCLE battery, it should NOT have a CCA rating in the specifications. That is the easiest method for IDing non TRUE deep cycle batteries.

These are only a few thoughts regarding type of battery, I am sure that others will add to the list.

AGM battery charging (per the battery university):
AGM batteries are sensitive to overcharging. These sealed batteries can be charged to 2.40V/cell (and higher) without problem; however, the float charge should be reduced to between 2.25 and 2.30V/cell (summer temperatures may require lower voltages).

Just my thoughts,

Don
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