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[NoMoreIdeas]

I noticed the same thing on my FX, but I wonder if it was the voltage / soc settling in cold weather? I accidentally charged to 100% so I went for a ride in 39F weather to get the battery down to the 60s. I turned it off at 66% soc, came out a few days later and it was at 53%. In the past week its gone down to 52% and I'm keeping an eye on it. This is a '18 7.2FX with 10k miles.

[sharagan]

Hi Guys,

there was a software troubleshooting last week and a week of observation comparing it to one of the demo bikes (Zero S) at the dealer. The demo bike stayed at 100% and mine dropped to 93%. So the situation did not change and they will try to find the root cause. One of the options I was presented with is a battery swap. I will report back once I have some news.

[valnar]

Hi Guys,

there was a software troubleshooting last week and a week of observation comparing it to one of the demo bikes (Zero S) at the dealer. The demo bike stayed at 100% and mine dropped to 93%. So the situation did not change and they will try to find the root cause. One of the options I was presented with is a battery swap. I will report back once I have some news.

Thanks, keep us posted.

I'm done riding for the season, so I charged my bike up to 71% about a month ago and today it was at 65%.  That was just a quick turn on/off though without any riding.  Last time I rode it adjusted even more, but can't with snow+salt on the ground.

[Crissa]

The old bikes don't go into storage mode if you flip them on and off...?

-Crissa

[valnar]

Hi Guys,

sharagan...  Are you in the EU?  I saw this post on Facebook and it was very interesting.  I'd check my own bike except that's freezing outside here in Ohio.
https://www.facebook.com/groups/zmcowners/permalink/3552888761446973/

[sharagan]

Hi Valnar,

thanks for sharing, this is interesting and yes, I am in the EU. This explains a lot and makes me happy, that there should be no problem with the battery after all. However, the fact that I contacted Zero directly 3 times already if by any chance the 1% a day discharge is known to them and they were even not aware of it (did not share any such info with me) still in November makes me rather angry. I was instructed to take the bike to the dealer. The bike is there since September. It seems that communication within Zero or Zero and the dealers is not a strong side and things seem to take a long time. I will share this DC-DC issue with my dealer. Will post an update afterwards!

[sharagan]

....how can a DC/DC converter behind an OBD2 Socket with nothing in it draw so much power? 

[havec]

When you think about it 1%/day is a lot of electrons going somewhere and generating heat in the process.  Maybe it is a design feature to keep something warm?  I don't think your average 18650  lithium battery loses that much of a charge/day

[TheRan]

It comes out to around 2.6W (63Wh over 24 hours) so not enough to provide significant heating. In terms of 18650s it's about the same as losing ten 2500mAh ones per day.

[sharagan]

I am getting my bike back now. Conclusion: the battery discharge is normal for European bikes produced 2020 and later due to the always on OBD2 port.
It turns off in long term storage mode and does not drain the battery. But from my understanding the storage mode kicks in after 30 days and according to the manual I should check my SOC level once a month, so without a manual switch this mode is not usable.

[valnar]

I'm done riding for the season, so I charged my bike up to 71% about a month ago and today it was at 65%.  That was just a quick turn on/off though without any riding.

'First time I touched my bike since this post -- It was at 54% today.

Assuming the discharge is linear (which it probably isn't), I might need to charge it just one more time before riding season.

[sharagan]

Hi Valnar,

I wonder what eats that roughly 10% per month in your case without the OBD2 port. I will try to disconnect the main fuse or the low power B+ fuse when the bike is at 40% and give it 2 weeks and check again.

[sharagan]

With regards to the information that the EU models have an always on OBD2 connector, which is powered even if the bike is turned off (backed up by the SOC drop of 1% per day) I assume that the DC DC Converter is always running. When searching on the internet I found the information, that this Sevcon converter has a life expectancy of 60000 hours, which translates to 6.8 years and also taking into consideration all the other upstream and downstream systems that are always on due to this and their life expectancy I would like to ask your opinion about a way to really turn off the bike for winter storage or if you think it is not necessary and complete overkill.

Thanks in advance for your insight.

PS. If I should create a new thread for this topic, please let me know

[GNU]

I just bought a 2020 FX in the US and it has this the battery drain issue.

My previous Zero SR 2014 (with battery from 2016) didn’t have it so I could leave it at 50% in a cold storage unit with no power.

I just dropped the bike off to have the tires upgraded and I also asked them to contact Zero about the battery drain bug.
My hope is that they’ll figure out what fuse needs to be pulled when it’s left in storage.

I’ll report back with findings soon.

[staples]

When you get it back, can you check to see if it has the 2 different OBD ports as described in the other thread? https://www.electricmotorcycleforum.com/boards/index.php?topic=10779.msg99997#msg99997

I found both of them, one is under the seat, the other is in front of the battery and sticks out of the side next to the side panel.