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The battery protection circuits should keep you from outright killing them. They may accelerate their normal natural degradation with continued high draw use. But in general they will not let themselves over discharge or over temp even when hooked in parallel. If you want to be extra careful I guess you could put a very big diode in series with each. I don't think that it is required however, I just wouldent hook a fully charged battery to a fully depleated one.
I think the range will not scale linearly with capacity because of the increased current draw as discussed. Also 4 amp hours is a big Li-on battery. The cells they use are generally less than 2 amp hours so if they are the connected 4 series (~16 Vish nominal) 2 parallel, they will have 8 cells total and probably have significantly less than 4 amp * hours per battery.
The manufactures are optimistic with their marketing of these things sometimes. There are some fascinating you tube channels where they test rated vs actual (see the you tube channel aVe, my favorite internet channel)
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84 930
18 Cayman GTS
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