I was just playing some loud bassy music on my eMac and noticed the CRT showing some light flicker-like effects. I didn’t put two and two together until it went away when the music stopped. Those are some strong magnets!
NiMH Batteries are weird. I have a ThinkPad with one, and earlier today it would shut off immediately when the charger was unplugged. I ran the battery recondition utility and now it works again, and appears to be holding great charge.
Welp, the TiBook's battery is dead. After 34 cycles, and 4 months of use it's kicked the bucket, being detected but no longer charging. In it's defense, it definitely sat for 20 years uncharged. Hopefully I can get it rebuilt at some point!