I put an Optima battery under my driver seat.  It lasted 1 summer.  I tried to get it warrantied and was denied.  I since have been using regular non deep cycle batteries from Walmart or Sam's.  They last about 3 years with alot of use.  I am also running a truck fridge 

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On Thursday, July 6, 2017 Dennis Haynes <d23haynes57@HOTMAIL.COM> wrote:
Patti,
The best part of this battery is the advertisements. Seriously the only real advantage over the standard group 41 is the fact that it is a sealed AGM battery. It actually has a lower A/H rating. Yes it should last longer than the Auto battery but the price is the same as almost 3 of those. While 300 cycles sounds impressive a true deep cycle battery should give 500 to 700. Most consider a lead acid battery to be cycled anytime you go below 50% state of charge and/or going above 80% such as a full/finishing charge cycle. Going to single group 27 battery either by changing location or modifying the battery box ala Karl's approach gets you to 100 A/H. A group 31 battery get you ~125 A/H. If you want a sealed battery a choice such as the Lifeline would be much better than the Odyssey. 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of PB
Sent: Wednesday, July 5, 2017 8:51 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Wheelchair Batteries vs GW Aux Battery

Has anyone used this battery
<https://www.optimabatteries.com/en-us/yellowtop-deep-cycle-battery/d3478>?
(*Optima YELLOWTOP® D34/78)*
I believe it fits under the driver seat perfectly if laid on its side.
There is a huge difference in prices from retailer to retailer.
Patti
90 Westy Automatic