Our Alliance came with a Renogy 100 Ah lithium battery, but we found that we could not make it through a night of boondocking on it. Our internet and security systems run on 12 volt and tend to drain the battery during the night hours.
I’ve been toying with the idea of upgrading the entire 12-volt system (and may yet do that) but as a start I ordered an Epoch 460 Ah battery.
I chose this 97 lb monster group 8D battery from Epoch (pronounced “epic”). The model is C12460A (C = version 2, 12 = 12 volt, 460A = 460 Ah) and I chose it primarily as a result of this YouTube video by Will Prowse about it.
Please see this page for a much more technical details (and warnings if you are purchasing one!)