Techstream readout, does it tell me anything?

Ideally you would record a "movie" of the battery block voltages while driving - with heavy accel and decel. You would look for any "odd man out". Since it looks like the 12V battery was disconnected or very low ar some point, you can't tell too much from the scan data. It resets to default values and requires some actual useage before the hv battery ecu relearns it.

Techstream doesn't perform a" battery test" by it self. Apps such as Dr Prius just monitors battery pack voltage and amps while you discharge it from "full" to "mostly empty" and then the app does some math to give you an approximate capacity.

While you could record a couple of movies of voltage / amp data during a forced discharge cycle, I would think that figuring the math would be more of a hassle than just paying a few bucks for the "pro" version of Dr Prius and a reccomended obd2 adapter.

It's up to you whether you want to be practive or reactive about the hv battery.

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There's a check called "Hybrid Health Check", pretty sure it's using Techstream?

Toyota Hybrid Health Check - Toyota UK

 

Like @mr_guy_mann mention above, you can use Techstream with the vehicle under load to help identify weak blocks, but you might do better using Hybrid Assistant for logging and the associated Hybrid Reporter app for graphing. You will need a quality OBD2 bluetooth adapter for Dr. Prius and most likely for Hybrid Assistant as well : Hybrid battery diagnostic and repair tool for Toyota and Lexus

If you have access (rent, borrow or shared) to a HA Prolong charger/discharger set up, then that may be the best option.

Even if you purchased a new HA Prolong charger/discharger, you could likely sell it for close to the purchase price.

It sounds like you have a DIY attitude, and may be interested in the hobby charger path, this thread may offer guidance :

Dorman HV Battery with a new lease on life..... | PriusChat

 

I see an ad for vehicle inspection touted as a "hybrid health check". Since it mentions checking the traction battery as opposed to "the 12V starter battery that's used to start the engine" I would think it is a fair bit of marketing BS.

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