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ok, what if i use headway 31820s cells, stack 4 in series in a springloaded pvc tube capped at both ends to get 12V nominal, then create 3 more tubes just like it for a total of 4 tubes. Then lay the 4 tubes flat, next to each other with all the positives on 1 end and all the negatives on the...

What happens if the leads on a single panel short to each other? Is there a fuse built into the junction box? Should an inline fuse be placed on one of the leads? If so, closest to panel or charge controller? I have 50' cables running thru an attic and don't want to burn the house down.

Thx. Suggestions on a reliable online supplier for that product and a battery management board for this application? I guess I will search for threads or videos for a battery build with that type cell.

Am I correct in calling the configuration in my photo a “4s4p” pack? Is this an acceptable configuration (versus 4p4s)? If so, do I need to shop for a BMS for 4s4p?

Need 12V, 50Ah or less. I have been using a MK Battery M22NF Gel for a couple years. I would like to move to something more compact and lighter weight with a form factor that is specific to my application. I would like the battery pack to be flat, like a brownie baking pan, it can be...

Does that mean I need qty 4 of a 4s BMS to work with a 4s4p battery?

Renogy manual: https://www.renogy.com/template/files/Manuals/RNG-CTRL-WND10%20Manual_V1%EF%BC%8E0_20181130.pdf My goal is a "flat" battery pack in the shape of a brownie pan or similar Here is a crude mockup using AA batteries. The white paper represents the PVC tubes they would slide into as...