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[Kill3rT0fu]

I made another post, but it seems the forums glitched and it didn't post.

I was wondering if anyone here could help me figure out what to look for to determine the health of my battery. I went fora ride (first one in a while) and after a 5-ish mile trip, I lost 9% battery life.

Logs are parsed here https://home.hasslers.net/zerologparser/parse_log.php?logfile=./logs/538SMLZ62MCG15637_BmsD0_2025-02-22.bin

I've also used the python tool, so I have a .txt log that's 77kb too big to attach here

[StableofZeros]

5 miles at what speed and temperature? If the general freeway range is 70, 9% is what, 6.5mi?so you’re looking at a delta of 10-30% depending on how accurate the GoM is “, which depends on prior rides. It could also average out on your next ride by maybe not decreasing quite as fast. You could also do the test zero does and run it to 0 and plug it in to 100% on a watt meter and see what it consumed.

[Kill3rT0fu]

5 miles at what speed and temperature? If the general freeway range is 70, 9% is what, 6.5mi?so you’re looking at a delta of 10-30% depending on how accurate the GoM is “, which depends on prior rides. It could also average out on your next ride by maybe not decreasing quite as fast. You could also do the test zero does and run it to 0 and plug it in to 100% on a watt meter and see what it consumed.

temperature was about 70F (21C) and the fastest I went was 45 MPH. Most of the ride was 35 MPH.

But as you said, prior rides were at 55 and 60 MPH, so maybe those are affecting it.

But for future reference, what am I looking for with the logs? Also, isn't draining the battery to complete 0% bad for it?

[T.S. Zarathustra]

The best way I've found is to measure how much goes into the battery. With the charge-tank I get report after each charge. Calculating from that my battery has about 90% of capacity left. 
Your riding style and speed will greatly affect range. As will environment, like hills, temperature and wind.
Running it to 0 is not optimal, but as long as you put it directly on charge it will be okay. There are safety margins built in. But don't store it overnight near empty.
I've seen recommendation to go 0-100% few times a year to help the BMS stay calibrated.

[Kill3rT0fu]

The best way I've found is to measure how much goes into the battery. With the charge-tank I get report after each charge. Calculating from that my battery has about 90% of capacity left. 
Your riding style and speed will greatly affect range. As will environment, like hills, temperature and wind.
Running it to 0 is not optimal, but as long as you put it directly on charge it will be okay. There are safety margins built in. But don't store it overnight near empty.
I've seen recommendation to go 0-100% few times a year to help the BMS stay calibrated.

Okay, I guess the consensus is to get a watt mater to measure how much is being put into the battery. I just figured the BMS would track all this and show in the logs somewhere.

[gt13013]

Yes, there is some info inside the logs that can inform you about the battery capacity and health.
Look at there: https://www.electricmotorcycleforum.com/boards/index.php?topic=11638.msg116919#msg116919
I have a spreadsheet where I summarize some capacities calculations. I have added some data extracted from your log. It seems that your pack is in much better health than mine (which is from 2023 whereas yours is from 2021). I attach the spreadsheet.

From the log, it seems that when you leave your bike resting, the SOC decreases. Is it the case ? I have 2 Zero (FXS 2016 and S 2023), and when I leave them in the garage (even for a long time) their SOC does not vary at all. 
It also seems that when your bike is resting, the SOC periodically adjusts for voltage. That do not happen with mine...

And also, your log has some problems. The lines are not in chronological order, and there are some inconsistencies. It would be better to share the bin files (MBB and BMS). If your bike has not been used for a long time, perhaps it would be good to use it a little bit. It will push away the old log lines and replace them by fresh ones!
 

[2020_SRS_Commuter]

Using SOC to judge how much went into my battery at home frustrated me immensely, so I bought a wattmeter. Some chargers also have a display that shows it too.
When I charge my bike to a target or to 100%, it reaches that SOC and then continues charging for a while before slowing and stopping. If I head out the the garage and its not finished, without a wattmeter IDK where it is with that. Did it just reach 90% and now needs 40 minutes before finishing, or has it been at 90 SOC for a while now?
Wattmeter solved all that for me.
As my battery aged I noticed that from 100 to 90 SOC would disappear very VERY quickly, then it would drop "normally" after.