I have a drawer of many Tungsten Es I need to do this too. Though I would hesitate using battery-less unless I replaced that barrel jack with a fixed cable.
In all seriousness, probably going to just add a JST connector internally to all of mine, gotta love old devices that just needed two wires for their battery, no need to bypass or fight against "smart" battery communication requirements like one has to for newer devices.
Oh yeah most definitely on that last bit. Gives another option for DIY builds. The idea of designing a replacement case that you can transplant the guts of a PDA into is an attractive one, especially as prices rise and devices in poor condition must be considered.
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Picture is from when I was de-batterying it. Works fine without.
since I mostly experiment its also a bonus when they work at all without a good battery. yknow how some get stuck waiting to charge.