Display Battery

Is there a way to determine the remaining lifespan of a Prius battery?

Its a 2002 Toyota Prius. Maintenance records are all good... but I'm wondering if there is a way for a mechanic/dealership to determine roughly how much longer before the primary battery needs to be replaced. Its a ~$2500 job, so it greatly effects the value of the car.
Currently it has 142k miles on it

The dealership can read the maximum and minimum cell group voltages but that doesn't tell all that much about how long it has to live. You can see if the battery is nearing the end of the service life by watching the state of charge and paying attention to whether the engine shuts off freely when the car is stopped. A normal first generation Prius will keep the indicated state of charge mostly between 1/3 and 2/3 full, dropping to 1/4 or even a smidge less if the car sits a long time in the ready state but just parked. Nearly full battery indications when you haven't gone down a long hill are suspicious. When the hybrid battery begins failing the engine will stay on a lot more, often to run conditioning cycles on the battery. Conditioning cycles are bad news -as far as I know they never occur unless the battery is in trouble. The displayed battery SOC cycles from nominal to nothing to full, usually faster than it could actually happen (a couple of minutes). You should assume any Prius that is running reconditioning cycles needs a battery already.

However, that is rare. I bought my 2002 with 103K miles, just watched the battery indicator to make sure it was behaving while I test drove it, and have put 53K trouble-free miles on it since then. The entire check-out was 10 minutes test driving it, 15 minutes under the hood and under the car (a visual inspection of the exhaust system for damage is a good idea), and it was mine.

The 2002 model year mostly had the older ECU. That version occasionally produced the Triangle Of Death!!! (sorry - the display is that scary with the big triangle) because the engine did not always start on the first try. Trying to start it again pretty much always works, and you have to shut it off and restart it 4 times to make the scary triangle go away. The cause is gunk in the throttle body; the Prius engine burps soot into the intake. My wife's 2002 did that once and got me into the habit of cleaning the throttle body at every 30K mile service. Toyota offered an updated ECU that cranked longer but I just kept cleaning the throttle bodies. They really do need it.

The weakest spot in any generation Prius is the 12 volt aux battery. Most (but apparently not all) the first generation had AGM batteries. I just replaced my wife's at 125K miles and 10 years; mine is original. The AGM kit sold at the first source is a popular replacement.

The one 12V battery, windshields, tires, and wiper blades are the only repairs either of our two 2002 Prius have ever needed. Both have had the battery sealant done on the recall. They are by far the most reliable cars we have ever owned.

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