JCat asked about replacing coach batteries. Optima batteries are a good choice for chassis batteries. I would recommend Trojan or Lifeline AGM batteries as a better choice for coach batteries. Why? Optima batteries are a combination starting/deep cycle battery or starting battery. Trojan and Lifeline AGM batteries are true deep cycle batteries. For coach batteries it is better to have deep cycle batteries.
I thought the coach/chassis batteries are 6v not 12v.
Brett the ones you have selected are 12v correct ?
You originally stated "Coach" batteries. Well, some interpret that as Chassis batteries and some, house batteries. It's terminology thing. No biggie. If, in fact you want to replace the "House" batteries, you've got lots of choices out there. I've had Trojans, Interstates and Costco 6V units in the past. To me, they've all lasted about the same.
So, since my thoughts are if, they all last about the same, then why not go for price. Well, I went for the Costco ones. Others of course will differ and that's perfectly fine. I made my own cables too. I used 1GA wire and so far, all the demand we've placed on those (4) Costco 6V units, dry camping and all, have been taken care of. I'd do it again in a heart beat.
Scott and Karla SDFD RETIRED
2004 Itasca Horizon, 36GD Slate Blue 330 CAT
2011 White Honda CRV EX-L,4WD w/NAV Toad 2008 Caliente Red LVL II GL 1800 Goldwing KI60ND
What size voltage batteries do you need. I replaced my wet cell 8d 12 volt house (coach) batteries with 2 Deka AGM 8D 12 volt batteries. With AGM (absorbed glass mat) they come completely factory sealed and are non-spillable and leakproof. They use the same charging voltage as a wet cell and will last many more cycles. They are rated at 245 amp hours. I paid $469 each including tax.
I just replaced mine this weekend with (2) Interstate deep cycles for $200. I've had good luck with the Interstate brand with all of my other vehicles. They are not maintenace free, I personally wouldn't want one either. Once a year you pop the caps and check the level (which I've never really had to fill). When the battery gets to be about 4-5 years old, its nice to be able to check the specific gravity of each cell to get a true feel of the condition of the battery before you hit the road.