This could just be a new Prius owner. But I'm worried. 2009. 65500m

Typically, the state of charge display shows the bars going down gradually, as in one bar at a time.

You do have a car/hv battery that is 9 years old and not knowing how it was treated prior to your ownership, I would assume above normal wear and tear. You could get a mini-vci with techstream software off of Amazon or Ebay couple with a old xp laptop and see what the techs at the dealership would see. They are cheap about $30-50. You can then see the charge state of the hv pack block by block. The weaker ones will be obvious.

You may be in the early stages of battery pack failure, it may last for years more or not, when the battery does act up you will get the dreaded red triangle of death. It means that error codes have been set and with the mini-vci you will be able to see what codes are set. The auto parts places with their code readers are seldom able to read the hybrid battery related codes even some repair place won't be able to read them without the proper reader and software like the mini-vci.

Not to worry you needlessly, but all hybrid owners have to consider this as part of ownership and will have to contend with this issue eventually if you own the vehicle long enough.

 

65,000miles/9yrs = 7,222.2miles/yr. VERY LOW. I would be concerned about that b/c of fraud (replaced combo meter from a low mileage combo meter), flood damage vehicles that get a clean title.

Did you run a car fax at the least?
Did you check on the VIN on Toyota.com or a local dealership prior to purchase, to see maintenance/recall history.

Get mini VCI to get dealer level diagnostic capability.

The HV Battery is like any other wear item (tires, brakes). It will need replacement at some time in the future. Start saving up for this. New OEM from genuine online Toyota dealers is $1800-$2500+. You have to make sure the dealer will sell to you. Also they don't ship it. AVOID scamist (craigslist), fraudBay, and other peddlers of module replacement, used/"reconditioned"/"rebuilt"/"remanufactured" HV Battery. These Frankenstein HV packs will not last. You will spend more time and money on warranty claims, as others have learned the hard way. Labor and car rental isn't covered, but part (HV Battery) replacement is.

A new OEM HV Battery will most likely give you 8-10+yrs, just like the original HV Battery that came w/ the car when brand new.

Start putting money aside for this repair or vehicle replacement.

 

welcome!

otoh, years are generally considered harder on the battery than miles. if the bars start to move up and down more and more rapidly, it probably is on the way out.
it may not be too late for reconditioning, i'm not sure.

if it throws a dash light, you can ask toyota customer care for some good will warranty assistance, you're only a year out, and some states get 10 years.

all the best!