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That plan should accomplish nothing meaningful. The amount of charge loss on an old battery can be shocking over the course of just a week. Every time it happens, a little more damage occurs.
Based on what I've seen on approximately 200 Prius battery failures, I wouldn't let a 10yr+/100K+ Prius sit for more than 1-2 days. If I had to let it sit for 7-10 days (e.g., trip or vacation), I would conduct a forced charge to full prior to leaving and upon my return a 12V reset with another forced charge to full PRIOR to driving.
For sitting longer than that I would have somebody drive it or install a grid charger.
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