bladest

Hi everybody, is there a way to diagnose battery health cells voltage with tech stream?
can you guide me i saw simular video for prius but for lexus gs450h 4th generation.
Using the original tech stream...

Lwerewolf

What's the difference between a prius and what you have?

bladest

Some priuses have litium ion polymer battery, for example, they are more generation priuses hybrids than gs, gs have 2 generation of hybrids only.... quite a huge difference...
also over the videos their software is very old and ancient cars as well...
so its hard to compare newer car and older car.Also they have few ecus and fewer modules to check... Also priuses with nickel metal hybrid battery have fewer modules and probably different ecus..
What are the maximum voltage value for each battery block cell is it 18v or more ?

Can you teach me how i can see current batteries cells health etcs...? Or show me or something.

Cwang

IMO the best way to test it is to put it in EV mode and see how far you can drive sedately on level ground. Compare it to someone else's distance achieved.
One way to check is with a voltmeter but given a 12v battery is troubling you, best leave that for a hybrid specialist.

bladest

How car can be put in ev mode ? i see options eco, sport ,sport plus mode only?
Ev mode exists for toyota priuses only... i dont know how this car can be put only in ev mode.

Cwang

There is a giant button that says EV MODE

bladest

i saw it now, its close to the circle know which i use to change eco,sport,sport plus...
thanks for the tip i will try it , when i change my tyres this week to measure how many distance km i can take with the car.
Whats the benchmark for it 10-20-30 miles or more? Ev mode?

Lwerewolf

The battery is 1.872KWh fully charged. The car keeps the SoC between 40 and 80%, so that's AT MOST 40% usable = 0.748KWh. If you start with 6 bars - that's ~60% (no, bars to SoC is not a linear mapping), so half that. You'll be lucky to see a kilometer.

You have techstream, you've seen the videos telling you how to check your battery - force charge to as much as you can, turn on all consumers (AC, all fans, heating, whatever), monitor voltage differences between battery blocks UNDER LOAD, right before the battery gets so low that the engine spins up to force charge it. Let's say that I'd be worried if I saw a difference of more than 0.8v between blocks, >1.2v generally trips an error code. Benchmark is <0.2v (practically brand new). For more details, do your own research, this has been documented so much over at priuschat, endlesssphere and elsewhere that it's beyond easy to get a good picture. There's also that thing called "hybrid health check" over at Lexus.

bladest

So if factory battery capacity is 1872khw per cell, it should show 18.72volts at maximum charged per battery module, if capacity is not lost right?

Lwerewolf

You said you're a teacher.

bladest

i was teacher but stupid company decided to remove me.I asked raise since my expenses raised as well and they decided to dump me.

Lwerewolf

My point was that I find that very hard to believe.

Anyways, plenty written on the topic, but it looks like you have to start with some basic physics, like what is current, voltage, power, energy. I've told you where to look.