Let me pass on my suggestions
Let me pass on my suggestions. I have a an 04 prius with 190k miles on original battery- yes I going on 15 years and still get 45 to 50 mpg.
1. Don't start the car with the AC on . Open the Windows and let the car cool off for a minute or two. Then set the stat for 78 or 79 degrees and close the Windows. This keeps the battery from discharging too deeply.
2. Avoid full throttle acceleration- especially as the car ages. Again this keeps the battery from rapidly discharging.
3. Drive the car every day. If your daily drive has a mix of suburban/city driving and highway driving, this will be a plus for the battery.
4. Brake gentlely and maximize regenerative braking.
5. Garage your vehicle if at all possible.
6. Make sure the hybrid battery cooling vent exhaust (in the corner of the back seat) is not obstructed.
I bought the car with 82k miles and have all the service records from day one. I've been using these suggestions since I bought the car in 2010. I don't know how it was driven previously but I know the hybrid battery has never been serviced. Also the 12v battery is 8.5 years old.