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I'm looking for a TiBook battery for a 3,5 model. Anyone know where I can still get one?

Apparently, yes. There’s an online store I was looking at last day for a battery for the DLSD PowerBook 17" (A1149, apparently a higher capacity than previous 17" batteries) and noted they have the Titanium batteries listed and (possibly) in stock. As for their inventory sourcing, I have no idea. They're called Global Laptop Batteries-dot-com.

[No — for those reading who have DLSD PowerBooks — they did not have an A1149 (17") or A1148 (15") direct replacement, and I'm not sure anyone does.]

Also, there's a vendor on ebay and amazon which sells legacy batteries called/branded CWK. At this time, I cannot recommend CWK. I bought a CWK battery for my key lime clamshell in April/May 2018, and I watched over the following five months as lithium cell after cell within failed (i.e., very specific charge percentage drops) until it no longer held a charge. Plus, CWK prices skyrocketed in the last nine months (in some cases, by up to 400%!) for reasons which are still not entirely clear to me.

Edit: Yes, they have the battery for your model.
 
Find one on ebay from a seller with good feedback.

This is what I did when purchasing the CWK battery.

The seller's feedback was (and still is) excellent. The CWK batteries are sold for multiple laptop products, including non-Apple products. A seller's high feedback for a product line they sell is not indicative of long-term product performance: the problems arose well after providing positive feedback, with no warranty recourse for the product. The most I could do was to write a review on the product itself, describing its long-term performance failure, in the hope that future buyers will heed that in their buying decisions.
 
This is what I did when purchasing the CWK battery.

The seller's feedback was (and still is) excellent. The CWK batteries are sold for multiple laptop products, including non-Apple products. A seller's high feedback for a product line they sell is not indicative of long-term product performance: the problems arose well after providing positive feedback, with no warranty recourse for the product. The most I could do was to write a review on the product itself, describing its long-term performance failure, in the hope that future buyers will heed that in their buying decisions.

This is exactly why product reviews are so important on ebay. Many items sold everywhere won't have the best longevity. It's part of saving money, because these less reliable items are often cheaper also.
 
This is exactly why product reviews are so important on ebay. Many items sold everywhere won't have the best longevity. It's part of saving money, because these less reliable items are often cheaper also.

Except… when they aren't.

The CWK product I bought a year ago has more than quadrupled in price from exactly one year ago, with no indication whatsoever there is anything substantively different about the cells used inside the battery.

The above vendor I mentioned to the original poster is new to me, but since stumbling onto it over the weekend, there appears to be a long reputation of consistency following their battery offerings. Unfortunately, they do not carry the clamshell iBook battery or I would be giving them a go.
 
If your willing to wade into the icky end of the marketplace, aliexpress has PowerBook batteries for sale. I purchased one for my 12" PowerBook for under 30$ CAD and received in within 2 weeks. I'm just calibrating it now but according to coconut battery, it has a 4200mah capacity. *edit - down to 4100mah.
 
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