Hello everyone,First time posting, so, thank you ahead of time for all your help!Project:I was tasked with creating an outdoor lamppost for an event at a campground (IE: no immediate electricity source). At first, it seemed quite simple, but, looking at the necessary requirements, it seems to be more complex than I thought. Requirements:I need to find a way to power a high-powered LED light bulb (ideally 12W equivalent) for 10 hours a day (for 3-4 nights - for a total of 30-40 hours) without immediate access to an electrical outlet. So, it would be around 20 watt hours a day. This battery source needs to be able to be outdoors, and face rain/weather. There may be a tarp, tent to cover it. I may have access to a generator to recharge my battery source at another location if need be.I currently have a bright DC 12V light bulb that would be ideal for this project, but, I could also use a AC light bulb if need be.Potential Solutions: Connected 6V Lantern Batteries: Connecting multiple lantern batteries together, and swapping them out on a daily basis. Walmart has a set of Rayovac Heavy-Duty Lantern Batteries for around $2.50 each. Pro: Connecting these batteries in parallel and series would give me the 20 ah, and 12v specs needed. \ It would come out to around $15 a day. Would be easy to put in a large water-proof container and connect to the lamppostCons: Bit wasteful - I'd burn through around 20 of these batteries, and would have to recycle/dispose of them Sealed? - Unsure if I could put them in a waterproof container. Do they need venting? Mid-range cost: Would come out to around $50-60 due to the number of batteries needed12V Deep-Cycle 20Ah+ Battery: A simple 20ah+ deep-cycle battery would provide me the DC power needed on a daily basis. I would then detach it during the day, and bring it to the generator to charge. Pro: Cost - Relatively cheap, at around $50, this battery option would be affordable Set it and Forget It - No need to connect multiple batteries together. This would just be an easy wiring job.Con: Venting - Unsure if I could place this in a simple waterproof container outside. Does it need to vent? Or, would a AGM deep-cycle battery be ok in a vent-free container? Recharging - Unlike the lantern batteries, I would need to bring this to a generator on a daily basis to recharge. Not the end of the world though.Ideas:I am vacillating between both options. Ideally I would like to go with the deep-cycle battery, but I am quite concerned with the venting problem. I don't believe the 6V batteries need to vent, so they could be placed in a simple container.Question(s): Does one of these solutions stand out more to you as the better fit? Are there other battery solutions that you think would work better? Do I need to use a deep-cycle battery, or would something like this battery work?Again, thank you ahead of time for any guidance you could provide!