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Even though it's boat cable, which has a higher rating than standard building cable, 80 amps is pushing it, unless it's a fairly short run, like a few feet jump to a starter or only intermittent use. otherwise it's typically rated at around 60, would be derated to around 50 or so in an engine compartment due to temperatures being hotter. Given it's boat cable, as you claim, it is being rated using marine standards ABYC instead of normal NEC standards for buildings. nec would rate it only around 30 amps for open 10ga wire.
if you have it up under cowling or in a box, might want to keep that in mind but I don't think that'll really be an issue for you, you won't be seeing those kinds of amps very often at all. No need for switches and stuff, just more stuff to add resistance and corrode on you. Tinned wire is a good thing, fine wire is even better, its easier to work with. personally i love using welding cable when i can get away with it.
it's up to you but a simple Anderson connection might be a quick and easy way to connect / disconnect it, and you can even put the fuse inline with it. that way you are not playing with nuts and bolts, stretching threads and up in that stuff every time you want to use it. an Anderson would also protect the disconnected ends too from most accidental shorting.
the lg batteries tend to be one of the higher grade batteries on the market, so you are good there, and yes, charging, most manu's prefer 0.5 to 1 C but will allow a bit more safely. 10A - 4C discharge, yah that right in range with a standard grade battery,
another place to look for cheap batteries, sometimes you get good finds, is portable tools, people hunk the pack because one cell dies and it kicks the whole pack but the rest of the cells are usable. home depot, lowes, or placesl ike that often have free battery disposal, and a quick talk to the manager, many times they are more than happy to give the old ones for free, because they have to otherwise pay to dispose generally. depending on what brand, size etc, the cells vary but you can build plenty of 'aux power' for essentially free.
aaron
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