First, I’d stock a bank of four 18650 cells, wired in a 2S2P configuration so I get a solid 7.4 V rail. I label each cell with its voltage, serial number, and a tiny sticker of the day it was inserted. I run 18‑AWG wire from the cells to a 12 V DC‑DC converter, then to a 5 A fuse that’s glued in place on the ground bus. The converter outputs 12 V for the cabin’s lights and a 5 V rail for low‑power gear, each with its own small fuse and a tiny LED that lights when the circuit is good. I keep a low‑dropout regulator for any 3.3 V devices, and all wires are twisted, color‑coded, and taped with labels so no stray connection can creep in. I place the whole assembly on an anti‑static mat, double‑check every ground path with my trusty multimeter, and I never use a wireless charger—just a good old wired USB port. And of course, I log every part and tweak in my spreadsheet, so next time I can improve the fail‑safe factor by a few more millimeters.

Thanks! I’ll definitely keep a spare fuse on hand, and I’ll make sure every connection is properly torqued so nothing slips. I’ll label the weight capacity on the case too, so nobody accidentally overloads the bank. It’s all about those little details that keep the power flowing.