Welcome, Justin!
I've seen lead-acid Prius conversions as well. You're obviously not going to get as much capacity in the spare tire well as the lithium packs, but you're also not going to spend 10k :P
Here it is... it's an open source project:
PriusPlus - EAA-PHEV
Quote:
Based on what we just did, we think with some additional pre-made components, it will be realistic for an individual owner of a 2004-200(9) Prius with no technical skills to budget under $3,000 for materials
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It's funny: there are a couple of Prius drivers in the EV group in Ottawa, and they joke that "Priuses are 'gateway' cars."