You have the equivalent of 2- 12V batteries hooked up in parallel . You have around 450Ah in total. Are you running them to a Battery switch with 1.2.Both,OFF isolated to positions 1 and 2 or are you combining them to one position. Updating a bank of batteries may require upgrading the battery charger. A good 40A smart charger will do for that setup. When designing a 12V electrical system you have to balance the size of the battery banks to the charger and to the needs and usage. A battery bank that is too large for the needs and usage will not draw down the batteries enough to engage the bulk charging rate which could lead to stratification which causes sulfating. (batteries need periodic strong charging currents to keep the chemicals properly mixed) If usage is not enough to bring the whole bank down to 60-70% of capacity you could split the bank into 2-225Ahr banks and alternate the banks per outing. It would be easier to bring down a 225Ahr bank and the other half would be kept in reserve. Charge batteries to 100% after every use, do not discharge below 50% of capacity, add distilled water to the cells as needed once a month and keep the terminals clean and tight and those batteries should last you 5-7 years. Keep your warranty papers as even the best batteries could shortly fail inexplicably.