I started up my iBook g3 after it's been sitting for quite a long time. It started right up and was charged to ~75% before I shut it down for the day and unplugged it. I'll see how it holds a charge. Can't get it on WiFi so I'm not sure what if anything I will do with it. Doesn't seem worth selling. I am kind of sentimental about it!
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The wifi connection issue is very likely related to the 802.11b protocol of the AirPort card being both too old for modern wifi routers to connect with it and also the modern wifi router using a minimum encryption standard of WPA2 Personal. The AirPort card is only able, at most, to connect to the older WPA (“WPA1”, basically) or to the very old WEP encryption scheme. WEP is highly advised to be avoided nowadays.
Sometimes a wifi router can be configured manually to broadcast and receive in 802.11b, 802.11b/g, and 802.11 b/g/n, but more often than not, most, at a minimum, they’re configured for 802.11g/n and later, such as 802.11n/ac).
If you still want to try out wifi with the iBook, I did something like this a few years ago for my iBook G3/466: I connected a much older wifi router, an old blue-and-black Linksys WRT54GL model, directly to my modern wifi router with an ethernet cable as kind of a secondary wifi access point for just the iBook.
On the older Linksys wifi router, I set it up to broadcast a 802.11b/g signal (I also had an AirPort Extreme card to try out with a PowerBook, as AirPort Extreme used 802.11g). I configured the Linksys to the maximum encryption level which that AirPort card could recognize (which, for that particular unit, did recognize WPA(1)). Then I set up that Linksys router to only recognize the MAC address of that AirPort card, which (in most cases) would ignore all requests from any other wifi device to connect. That way, the older wifi router could still pass along the connected, recognized AirPort card to the main wifi router to get onto the internet. It wasn’t truly “secure”, but it was a step toward that for the sake of fun.
Eventually, I found one of those tiny, discontinued 802.11n USB wifi adapters which would work on PowerPC Macs, and I used that instead for the iBook. Even so, in 2019, it took some searching about to find the right kind of adapter with the right software bundled. Unfortunately, I no longer have that USB adapter (I gave it away with another iBook) and have been unable to find a replacement. That iBook I used to connect with AirPort is connected nowadays to my network with an ethernet cable.