You should have two 12V
group 24 Interstate SRM 24 deep cycle Marine/RV batteries in your 2013 25' International. I would recommend that you replace your batteries with the same. Other folks have also had success with Kirkland (Costco) Deep Cycle Marine Group 24 batteries as well as Walmart Marine Deep Cycle Group 24 batteries. Make sure whatever you choose that you select deep cycle Marine/RV batteries.
These batteries are relatively low cost and easy to upgrade. Make sure you disconnect the negative terminal first, then the positive terminal, before removing the existing batteries. After installing the new batteries, connect the positive terminal, then the negative terminal last. This avoids the risk of shorting the battery when touching the positive terminal if the wrench were to short to the chassis.
These batteries are known as flooded lead-acid batteries. They require some basic care. Check the liquid levels from time to time and fill them up with distilled water if they are low. Avoid connecting your RV to shore power with the Use/Store switch in the Use position for long periods of time. Doing so will harm your batteries because you likely have a single-stage battery charger as part of your RV's power converter. You can Google "RV single-stage battery chargers" for a detailed description of the issue.