It's a group 24 size battery. That's what the DP24MF stands for. A Centennial marine cranking/deep cycle battery. They can be bought for about $85.
You need to find out a bit more regarding your batteries. What is the fluid level in the cells? What is the specific gravity of the fluid? 1.277 specific gravity is 100% for a 12v battery at 12.7-12.8 volts. A battery hydrometer is a very useful item in your camping toolbox and are pretty inexpensive. The connections appear good, is the ground connect in equally clean shape?
If batteries have been repeatedly pulled down to less than 50% state of charge (12.1 volts) , they will be ruined very quickly. It is very important that you keep an eye on voltage levels and current flow. Know the difference (and importance) of what bulk charge, trickle charge, float charge is.
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2016 F350 CC Dually Powerstroke 4x4
2014 Cedar Creek 34RLSA w/Level Up
2007 HD Ultra Classic 103
USS Pyro AE-24 WestPac MM2 '71-'75
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