Join Date: Jun 2010
Location: Pac NW
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You have 2 batteries.
1. 12V battery, that one being deep cycle AGM battery with thermistor (temp sensor) and gas vents. Thermistor you simply unplug, GENTLY peel off and then reinstall onto a new battery. Maybe tape over to secure in place. NO ONE makes battery with vent hose provision, unless there is new development that I do not know off, I have heard rumors in Prius forum. Usually, folks replace 12V with Yellow Top Optima but there are less costly options from Energizer and other battery manufacturers. You do not need cranking power as that battery does not start your engine. OEM Panasonic usually lasts 7-10 years. threshold is anything less than 11.7V state of charge.
Please read carefully: provide back up power during battery replacement (15-20 min or so) as in some cases, simple removal results in major explosion of warning lights in the dash. A simple back up through power outlet will do. If this happened, cycle vehicle Start/Shut down 3 complete cycles in a row.
2. Traction, or hybrid battery. Those last average 7-10 years, Toyota syas - for the lifetime of vehicle. This is a major $$ item and requires special trained technician.
Also, you need a better mechanic, if your dealer does not know such basic things.
If you have navigation, sit in the car, turn key to Aux or II position, or press Start button twice without touching brake pedal. Then press and hold Info button on nav, while flipping light stalk On/Off 3-5 times in a row. Full lights/Off. This should put nav into diagnostic mode display and you can track battery voltage from there.