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[sharagan]

Hi Guys,

I would like to ask about your observations on battery SOC drop on a parked motorcycle. I noticed a drop from 60% to 55% in 3 days and to 50% in a week.
I have a Zero FXS 7.2 2020. It is parked in a heated garage with 20 degrees Celsius and no direct sunlight.

Is this normal or should I be worried?

Otherwise the bike is great and I managed to put 1000kms on it in a period of a month.

Thanks in advance for your observations.

[princec]

That sounds unusually high; I thought figures of just a few % in a month were the norm, even connected to the BMS.

Cas

[sharagan]

Doesn't seem normal to me too, that is the reason why I wanted to check with you guys for comparison. By the way, I charge it with the onboard charger and the firmware is up to date.

[valnar]

I have a 2020 FXS 7.2 as well.  Mine does not do that.

[sharagan]

Do you think that leaving it for 24h on the charger and aligning the cells would resolve the issue? Thanks.

[Kappi]

Hi Sharagan,

as you wrote, try charging it up fully and let it sit for a day or two afterwards. This would rule out miscalculated SOC.
If it is still discharging then, something isn't right.

[Crissa]

Mine loses a % per day, but it depends upon what I left it at (higher == more loss) and what the temperature swing was.  If the swing was 50° I'll lose several percent.

-Crissa

[sharagan]

Hi Crissa, did you by any chance consult it with the dealer? I'm interrested, what they had to say to it.

[staples]

Those number seem unusually high for a discharge rate even at that SOC. For long term winter storage on my 2018 FXS 7.2, I've seen a few percent drop over a month or two during a Chicago winter (temps ranging from -10c to 10c). This was following the manual and starting at 60% SOC.

Since the USA can't get their *stuff* together with the Coronavirus and I haven't been riding as much and I have seen some quicker drops from a 100% SOC in recent months. I was thinking it might be related to the battery getting older, but am now wondering if it has anything to do with recent firmwares. Time to test and gather some logs.

[Crissa]

The service tech said a small amount of loss is normal.  My overall range is pretty near what you'd expect, so... I dunno.

I think it doesn't like temperature flux.

-Crissa

[havec]

1%/day on my 2020 FX7.2 
I should specify that it was from 100% to 92% over 8 days plus minus a day.
I have my bike at a second mountain home so it spends a a lot of time in the garage.
This winter will be a good test of the storage mode that I read about here.
31% loss in 23 days (1.3%/day) of sitting in a cool garage.
Did we ever get an explanation of where the electrons are leaking to?

[valnar]

Hi Guys,

I would like to ask about your observations on battery SOC drop on a parked motorcycle. I noticed a drop from 60% to 55% in 3 days and to 50% in a week.
I have a Zero FXS 7.2 2020. It is parked in a heated garage with 20 degrees Celsius and no direct sunlight.

1%/day on my 2020 FX7.2

WTF?  That doesn't seem right.

[princec]

It really isn't. That's the discharge rate of an olde worlde lead-acid battery, not a state of the art lithium jobbie.

Cas

[sharagan]

Mine is currently at the dealer, they charged it to 100%, let it sit and same result 1% a day. This is roughly what I observed as well. Funny thing is that they compared it with one of their demo bikes and it was the same(in a heated workshop). Thanks Havec for sharing, glad I am not the only one. But still this is strange, hope it gets sorted. Next step is for Zero to log onto the bike.

[Jan Wespelaar]

Hi, I have also a FXS2020, I have witnessed the same about 1% discharging a day. But as a remark I have also seen that this discharging rate is slowing down below 60% of load to about 1% every 3 days? I haven't questioned this until yet, please keep recording the feedback you receive from your dealer. For sure, it would be handy it the discharging rate would be lowered.

Jan