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Optima Red Top 34/78 were the standard issue. I use 51Rs most of the time, as they will fit both 802s and 803s. Find a high quality battery that will fit in the spot and give it hell. You don't need the high cranking amps of larger batteries, due to your location. We need the high amps up here...
You really should replace them both at the same time, with identical units (at the same time, not necessarily what was there before). Just a matched pair.
The TMs for your machine can be found here: https://steelsoldiers.com/threads/all-the-manuals-for-the-mep-802-5kw-generator-and-mep-803-10kw-generator.148871/
I would start by taking your batteries out to a local auto store and have them both tested. If you dont have 24+ volts, your machine isn't going to do much of anything. They can show surface voltage, but can fail under load to almost zero amps. If you have not downloaded the TMs for this set...
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