The Green753's CMOS battery is a 3-cell VARTA that is soldered directly to the motherboard. It is located smack in the middle, directly below the CPU socket. These batteries are highly prone to leaking in age, and should be removed in any Green753 to prevent damage. The leads are long enough that clipping the battery out is pretty easy.
Like nearly ever 90s laptop, the plastic on the Green753 is quite brittle with age. I've been told that the hinge mounts break, though I haven't seen that yet myself. The LCD lid latch and hinge covers are prone to falling off, and many examples in the wild will have these parts missing. If you have one, handle it with care.
The speakers in these sound so utterly awful that I refuse to believe that they were that bad when new. My guess is that they all degrade with time. Using headphones will work, but the audio output is a bit finicky out of the jack. It has a bit of a background hum, but otherwise does sound alright. The main issue is that the volume adjustment is "jumpy". It will have a gradual change, then suddenly JUMP to be way louder from one increase level. Once you get it set at a good volume, it's fine.
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