Costco battery?

So, i went to check Costco. They only have 14 and 15 code batteries.

Will those work? If not, off to Canadian Tire or Walmart.

You still have not answered the question: What size is your current battery.

As I said before, you want a Marine battery that is the size of your current battery. You may find that your battery box is bigger than your current battery and may accept a larger battery. If so, you might consider installing a bigger battery that will be able to store more energy.

But at a minimum, buy the current size you have. If in doubt, use a tape measure and measure the size of your current battery and compare it to the new one.

There are 3 basic kinds of wet (lead-acid) batteries:

* Cranking batteries ("car batteries")
* Marine batteries
* Deep Cycle batteries.

The difference between them is that cranking batteries are designed to provide a lot of current over a short amount of time, whereas a deep cycle battery is designed to provide less current over a longer period of time.

Typically cranking batteries have "sponge" lead plates that have more exposed surface area and can thus dump a lot of power quickly, as a starter motor needs.

Deep cycle batteries have solid lead plates and cannot usually provide as much current but tolerate deep discharges and more discharge/recharge cycles than a cranking battery.

Marine batteries are usually in-between, with a compromise of performance of the two.

For an RV, what you really want is a deep cycle battery.

But most big box stores don't carry them. They typically carry cranking batteries and marine batteries.

So if you are just going to run down to your local big-box store and buy a battery, buy the biggest Marine battery that will fit in your battery box. It will probably last you 5 years without you monkeying with it. Maybe longer if you know how to add distilled water to it.

Here are your Costco choices. Which one you choose depends on which one matches the size of what you already have, or whatever will fit in your battery box: