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Unfortunately that's to be expected. It's very easy to kill components, it's basically a rite of passage around here for broken stuff to double a project's budget. It ain't a cheap hobby, especially if your tools are subpar.

That's a fine build, and my favourite shell colour!

That's unfortunate. Try removing the cells for a minute and putting them back in to force a full saturation reset. If that doesn't restore the outputs to normal, then yeah it has probably fried. If the voltage and logic lines mix, components die. Loss of components always happens in the...

The Wii side looks clean, no visual issues that I can spot. How long is the twisted pair? Can you show a photo of the PD module?

The 3.3v wire has a stray strand that might be fucking with nearby components, and the 1.8v wire looks awfully close to the neighbouring GND wire. I don't see any obvious shorts or missing components, so I say desolder all the wires except for the power button and battery inputs, and then...

This is with the Wii disconnected from the PMS, yes? Can you provide a clear photo of the current state of the PMS so I can eyeball it for potential shorts?

Black probe on GND, red probe on the voltage output pad. The positions on a multimeter dial refer to (partly) the maximum displayable reading value for the display. It only has so many characters to use, so they break up the reading brackets. Some of the voltages on the PMS are above 2v, but...

Well done everyone!

Yeah the PMS and PD series boards from 4layertech are a complete voltage regulation, battery management and charging solution. Just add cells. The PMS only supports a 1S cell arrangement, so 4 cells in parallel is correct. If you connect any in series to raise the voltage, you'll kill the PMS...

The little dot on the Wii. That big old blob is probably touching another pad, and even if it isn't it will eventually rip the U10 via out of the board. There's too much plastic jacketing removed. For safety, however long/deep the pad that you're soldering to is, is how much metal you should be...

I have the excitement!

It's impossible to diagnose the problem with your wiring the way it is. You have too much exposed wire with stray strands pointing out all which ways that could have caused a death short, and your U10 via joint is a boulder that is probably touching other vias. You need to disconnect the cells...

A damn fine effort it was! I am looking forward to seeing it fully completed later!

You old dudes making these legendary devices was what got me into this cash hole of a hobby all those years ago. Internals are cleaner now tho lel

A lot to do in 4 days, but I believe!

That case is a blast from the past

Also worth keepig in mind that the PD-2/PD-3 modules from 4layertech do not work with the old v1 PMS boards. If you're going to use the old PMS, you'll have to use a 9v or 12v DC barrel jack power supply to charge it.

Excellent work! Glad to be of help :)

Reconnecting them will be very fiddly. You'll want a magnifier, a fine chisel tip, liberal usage of flux, and a lot of patience.

You have indeed severed some of the NAND traces. You can make it work again if you use some magnet wire to reconnect the flash chip legs to the vias for the severed traces. Pinout here for your reference