I chose the larger box b/c it has handle and enough room for a charger and the AC adaptor in case I have to make a hurried dash to the storm cellar outside. I also like the two 12V auto DC ports on the outside. I have a 12V to USB adapter I can plug in to one to charge my cell phone.

The post I made above features a battery box with carrying handle and a button on the exterior you press to check the charge in the battery. I think that's an option worth the added cost. Total for the entire setup was >$260.

Here are links to my setup with the carrying case that I can easily take along camping, etc. Weight is probably short of 32 lbs all included. DC adapter https://tinyurl.com/yboxej38 35 amp AGM battery https://tinyurl.com/ybvsgps4 AGM battery charger https://tinyurl.com/y7mld7bu Battery Case https://...

Not that kind of a cellar. It's out in the yard and no power inside. Anyway I would not want to lug a 100a battery plus the other vital gear that I'd want to take along.
Thanks Cleve

Update,
Thought about the possible need to quickly grab my CPAP machine and head for the cellar in the event of severe weather here in Oklahoma so I bought the box which will have room for the CPAP machine and the accessories too maybe. Thinking I made the right choice.

Thanks CapnLoki,

Question,
is your opinion on a bit of overkill related to the size of the box or the features? I do think the box is overkill but would sacrifice size for what I think are very complete features. Esp not having to open the box to check voltage.
Thanks, Cleve

Getting ready to set up my battery backup. (Resmed Airsense 10.) I bought the ResMed DC Converter For AirSense™ 10 and will buy a 35a AGM bettery so am now looking at this trolling motor box. https://tinyurl.com/y733vxnc Not sure I'll ever buy a 2nd battery for more capacity but the box would hold t...